The median Social Security benefit was $16,295 for men and $11,999 for women in 2012, AARP found. Retirement savings. Just under a third (30 percent) of retirees receive income from either a traditional pension or take withdrawals from a retirement savings account such as a 401(k) or individual retirement account.
The Sodium atom. 1  The Na atom has an equal number of electrons and protons (11 e-and 11 p+). 2  This atom too is unstable because the outer valance shell of electrons has only one electron in it. 3  To be stable the outer shell of electrons should have eight electrons.
A lithium ion has the same electronic structure as a helium atom (He). Sodium, Na. Sodium is also in Group 1. It has one electron in its outer shell. When this electron is lost, a sodium ion Na + is formed. A sodium ion has the same electronic structure as a neon atom (Ne). Magnesium, Mg. Magnesium is in Group 2. It has two electrons in its outer shell. When these electrons are lost, a magnesium ion Mg 2+ is formed. A magnesium ion has the same electronic structure as a neon atom (Ne). Calcium, Ca