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From Wikipedia
A loose sentence is a type of sentence in which the main idea (independent clause) comes first, followed by dependent grammatical units such as phrases and clauses. The meaning of a loose sentence can be easily understood in the very beginning of the sentence, unlike a periodic sentence where the subjectverb of the base sentence is completed at the end.
It adds modifying elements after the subject, complement, and verb.
Loose sentences may make a work seem informal, relaxed, and conversational. However, according to Strunk and White's The Elements of Style(2000), a succession of loose sentences, especially those of two clauses, is to be avoided because of "mechanical symmetry and singsong".
Examples
 He went into town to buy groceries, to visit his friends, and to go to the bookstore.
 "Bells rang, filling the air with their clangor, startling pigeons into flight from every belfry, bringing people into the streets to hear the news." (From the English Reviewer)
 She drove her car to go to the movie, and get gas.
In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in vertical columns. Elements of the same period have the same number of electron shells; with each group across a period, the elements have one more proton and electron and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases. For example, the alkaline metals lie in one group (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at a noblegas electronic configuration. The periodic table of elements has a total of 109 elements.
Modern quantum mechanics explains these periodic trends in properties in terms of electron shells. As atomic number increases, shells fill with electrons in approximately the order shown below. The filling of each shell corresponds to a row in the table.
 1s
 2s 2p
 3s 3p 3d
 4s 4p 4d 4f
 5s 5p 5d 5f
 6s 6p 6d
 7s 7p
 8s
In the sblock and pblock of the periodic table, elements within the same period generally do not exhibit trends and similarities in properties (vertical trends down groups are more significant). However in the dblock, trends across periods become significant, and in the fblock elements show a high degree of similarity across periods (particularly the lanthanides).
Periods
Seven periods of elements occur naturally on Earth. For period 8, which includes elements which may be synthesized after 2010, see the extended periodic table.
A group in chemistry means a family of objects with similarities like different families.
Chemical elements in the first period
The first period contains fewer elements than any other, with only two, hydrogen and helium. They therefore do not follow the octet rule. Chemically, helium behaves as a noble gas, and thus is taken to be part of the group 18 elements. However, in terms of its nuclear structure it belongs to the s block, and is therefore sometimes classified as a group 2 element, or simultaneously both 2 and 18. Hydrogen readily loses and gains an electron, and so behaves chemically as both a group 1 and a group 17 element.
 Hydrogen (H) is the most abundant of the chemical elements, constituting roughly 75% of the universe's elemental mass. Ionized hydrogen is just a proton. Stars in the main sequence are mainly composed of hydrogen in its plasma state. Elemental hydrogen is relatively rare on Earth, and is industrially produced from hydrocarbons such as methane. Hydrogen can form compounds with most elements and is present in water and most organic compounds.
 Helium (He) exists only as a gas except in extreme conditions. It is the second lightest element and is the second most abundant in the universe. Most helium was formed during the Big Bang, but new helium is created through nuclear fusion of hydrogen in stars. On Earth, helium is relatively rare, only occurring as a byproduct of the natural decay of some radioactive elements. Such 'radiogenic' helium is trapped within natural gas in concentrations of up to seven percent by volume.
Chemical elements in the second period
Period 2 elements involve the 2s and 2porbitals. They include the biologically most essential elements besides hydrogen: carbon, nitrogen, and oxygen.
 Lithium is the lightest metal and the least dense solid element. In its nonionized state it is one of the most reactive elements, and so is only ever found naturally in compounds. It is the heaviest primordial element forged in large quantities during the Big Bang.
 Beryllium has one of the highest melting points of all the light metals. Small amounts of beryllium were synthesised during the Big Bang, although most of it decayed or reacted further within stars to create larger nucleii, like carbon, nitrogen or oxygen. Beryllium is classified by the mathematics, a periodic function is a function that repeats its values in regular intervals or periods. The most important examples are the trigonometric functions, which repeat over intervals of length 2π. Periodic functions are used throughout science to describe oscillations, waves, and other phenomena that exhibit periodicity. Any function which is not periodic is called aperiodic.
Definition
A function f is said to be periodic if (for some nonzero constant P) we have
 f(x+P) = f(x) \,\!
for all values of x. The least positive constant P with this property is called the period. A function with period P will repeat on intervals of length P, and these intervals are sometimes also referred to as periods.
Geometrically, a periodic function can be defined as a function whose graph exhibits translational symmetry. Specifically, a function f is periodic with period P if the graph of f is invariant under translation in the xdirection by a distance of P. This definition of periodic can be extended to other geometric shapes and patterns, such as periodic tessellations of the plane.
A function that is not periodic is called aperiodic.
Examples
For example, the sine function is periodic with period 2π, since
 \sin(x + 2\pi) = \sin(x) \,\!
for all values of x. This function repeats on intervals of length 2π (see the graph to the right).
Everyday examples are seen when the variable is time; for instance the hands of a clock or the phases of the moon show periodic behaviour. Periodic motion is motion in which the position(s) of the system are expressible as periodic functions, all with the same period.
For a function on the real numbers or on the integers, that means that the entire graph can be formed from copies of one particular portion, repeated at regular intervals.
A simple example of a periodic function is the function f that gives the "fractional part" of its argument. Its period is 1. In particular,
 f( 0.5 ) = f( 1.5 ) = f( 2.5 ) = ... = 0.5.
The graph of the function f is the sawtooth wave.
The trigonometric functions sine and cosine are common periodic functions, with period 2Ï€ (see the figure on the right). The subject of Fourier series investigates the idea that an 'arbitrary' periodic function is a sum of trigonometric functions with matching periods.
According to the definition above, some exotic functions, for example the Dirichlet function, are also periodic; in the case of Dirichlet function, any nonzero rational number is a period.
Properties
If a function f is periodic with period P, then for all x in the domain of f and all integers n,
 f(x + nP) = f(x).
If f(x) is a function with period P, then f(ax+b), where a is a positive constant, is periodic with period P/a. For example, f(x)=sinx has period 2Ï€, therefore sin(5x) will have period 2Ï€/5.
Doubleperiodic functions
A function whose domain is the complex numbers can have two incommensurate periods without being constant. The elliptic functions are such functions. ("Incommensurate" in this context means not real multiples of each other.)
Complex example
Using complex variables we have the common period function:
 e^{kix} = \cos{kx} + i\sin{kx}
As you can see, since the cosine and sine functions are periodic, and the complex exponential above is made up of cosine/sine waves, then the above (actually Euler's formula) has the following property. If L is the period of the function then:
 L = 2\pi/k
Generalizations
Antiperiodic functions
One common generalization of periodic functions is that of antiperiodic functions. This is a function f such that f(x + P) = −f(x) for all x. (Thus, a Pantiperiodic function is a 2Pperiodic function.)
Blochperiodic functions
A further generalization appears in the context of Bloch waves and Floquet theory, which govern the solution of various periodic differential equations. In this context, the solution (in one dimension) is typically a function of the form:
 f(x+P) = e^{ikP} f(x) \,\!
where k is a real or complex number (the Bloch wavevector or Floquet exponent). Functions of this form are sometimes called Blochperiodic in this context. A periodic function is the special case k = 0, and an antiperiodic function is the special case k = Ï€/P.
Quotient spaces as domain
In signal processing you encounter the problem, that Fourier series represent periodic functions and that Fourier series satisfy convolution theorems (i.e. convolution of Fourier series corresponds to multiplication of represented periodic function and vice versa), but periodic functions cannot be convolved with the usual definition, since the involved integrals diverge. A possible way out is to define a periodic function on a bounded but periodic domain. To this end you can use the notion of a From Yahoo Answers
Question:I am horrid with grammar. What are some tips to finding the Main Verb in a periodic sentence. Maybe some examples too.
Answers:In terms of style, you will also find that sentences are classified as periodic or cumulative sentences. Periodic sentences begin with modifying phrases and clauses, sometimes piling them on, and then end with an independent clause, period. If, instead of listening to the warmongers of the militaryindustrial establishment, the politicians had only listened to what people had been writing in their letters and in the newspaper columns, if they had only listened to what the demonstrators had been shouting in the streets and on the campuses, if they had only listened to what was in their hearts, the war would have ended long ago. Cumulative sentences, on the other hand, begin with the independent clause and then finish with a flurry of modifying constructions. See the sentences of President Kennedy above. Again, it is not so much that one kind of sentence is to be preferred over another but that a good craftsperson uses the right tool for the right job and doesn't use the same tool all the time. It does no good to be overly conscious of these sentence types in the first draft of your essay, but as you review your essay, keep in mind that too many sentences of any one kind especially too many simple sentences will be tedious for your reader. On the other hand, as we have seen, there is nothing like a brief sentence to drive home a point after a lengthy, rambling sentence. Try spicing up your prose by combining sentences into different structures. Phrases: A PHRASE is a group of words which contains neither a subject nor a verb. (It may, however, contain a verbal form such as an infinitive, a participle, or a gerund.) Clauses A clause is a group of words containing at least a subject and a verb (the baby ate), and frequently it lets its hair down by containing some kind of a complement as well (the baby ate the goldfish). There are two kinds of clauses: independent and dependent. Visit the sites below for more information:Question:Like so: It had been a typical morning that consisted primarily of bleak, unmotivated scribbles in my notes, drawn to the tune of my teacher s dull, monotonous rambling, when tragedy struck. Is this a correct periodic sentence?
Answers:no this is not a periodic sentence.Question:
Answers:A compound sentence contains at least two (2) independent clauses. An independent clause can stand alone as a sentence, beginning with a capital letter and ending with terminal punctuation such as a period. The following are quotes, but they will act as an example to help you. A man may die, nations may rise and fall, but an idea lives on." (John F. Kennedy) "Any jackass can kick down a barn, but it takes a good carpenter to build one." (Lyndon B. Johnson) "It was dawn outside, a glowing gray, and birds had plenty to say out in the bare trees; and at the big window was a face and a windmill of arms." (David Foster Wallace, Infinite Jest, 1996) "Tell the truth, work hard, and come to dinner on time." (Gerald R. Ford) "I have often wanted to drown my troubles, but I can't get my wife to go swimming." (Jimmy Carter)Question:Is this an example of a compound sentence? I wanted to buy the red sweater but they sold the last one of Friday. is it an example of a compound sentence? if it is can you tell me what the subject, verb and FANBOYS is? i think the FANBOYS is BUT whats the subject and verb then? thanks xo
Answers:It is a compound sentence. Thus there are two subjects and two verbs. For the first part, I is the subject and WANTED is the verb. In the second part, THEY is the subject and SOLD is the verb.From Youtube
Sentence Fragments :This story gives examples of sentence fragments and complete sentences. (This is a slower version of the one that I put up last summer.)