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# electron configuration calcium ion

Question:I know that the electronic configuration of Cr only is [Ar] 3d5 4s1. But how about Cr2+?

Answers:[Ar]3d4 4s0 elimination of electron starts from the outermost shell

Question:Write the electron configuration for the sodium atom and for the simple ion it most commonly forms. Indicate which noble gas has the same electron configuration as the ion. I've got about 20 more of these problems and I haven't a clue how to answer them. I'm hoping somebody can explain this to me so I can figure out the rest on my own. :] Thanks!

Answers:I went to http://chemistrytable.webs.com/electronegativityconfig.htm and found that the electron configuration for sodium is: [Ne] 3s1 This is the shortcut method, and from the 3s1 you can take off one electron to make "Ne" (its closest noble gas). Na+1 (I removed one electron) Try to figure out the rest for yourself.

Question:For the given electron configurations below, enter the chemical symbol for the corresponding neutral atom, cation, or anion. [Ar] 3d2 __5+ [Ar] 3d4 __5+ I thought it was Co5+ then Cu5+ but its not? Should be easy, I'm just confused with if 4s2 / 4s1 comes into play?

Answers:I am confused too - we should be seeing 4s But we are lookiing for an element that after removing 5e-s has two valence electrons above Ar so I would go with Mn+5 and then Co+5 for the next one

Question:Ions are atoms with either extra electrons or missing electrons. Thus, ions have a negative or positive charge. Examples, The potassium atom, K, has 19 protons and 19 electrons. The potassium ion has 19 protons and 18 electrons, written K1+ (1 more proton than electron). The nitrogen atom, N, has 7 protons and 7 electrons. One nitrogen ion has 7 protons and 10 electrons, written N3- (3 more electrons than protons). I think the answer is Ca2+ i just want to be 100% sure