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.
Sodium places its eleventh electron in a still higher energy level, the M shell. From sodium to argon, this shell is gradually filled with electrons until, once again, a maximum of eight is reached. Note that after the K shell with its maximum of two electrons, the maximum number of electrons in any other outermost shell is eight.