Chemistry Qusestion II?

Question

Given that the electron configurations for phosphorus is 1s^2 2s^2 2p^6 3s^2 3p^3
A) How many electrons are in each atom?
B)How many unpaired electrons does an atom of phosphorus have?
C)What is its highest occupied energy level?
D)How many inner-shell electrons does the atom contain?
E)In which orbital(s) are these inner-shell electrons located?

Answer 1

A) Add the # of electrons 2+2+6+2+3 = 15 electrons
B) # unpaired electrons is 3. These are the 3 in the 3p^3.
C) Third level is highest occupied. It is the highest princilple quantum number, n = 3
D) 10 inner electrons. These are the ones in levels 1 and 2
E) Inner electrons are 1s^2, 2s^2, 2p^6 = 10

Answer 2

A)15

B)3

C)3p

D)10

E)1s,2s,2p

Answer 3

The answer is four.