Question

Use the periodic table to write electron configurations for each of the following elements. Represent core electrons with the symbol of the previous noble gas in brackets.

Part A

P

Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p2 should be entered as [He]2s^22p^2.

Part B

As

Part C

Sr

Part D

Sb

Answer 1

A)

Number of electron in P = 15

Electronic configuration is 1s2 2s2 2p6 3s2 3p3

Noble gas having lesser electron than P and closest to it is Neon (Ne)

Number of electron in Ne = 10

electronic configuration of Ne is: 1s2 2s2 2p6

So, electronic configuration of P in noble gas form is: [Ne] 3s2 3p3

Answer: [Ne]3s^23p^3

B)

Number of electron in As = 33

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3

Noble gas having lesser electron than As and closest to it is Argon (Ar)

Number of electron in Ar = 18

electronic configuration of Ar is: 1s2 2s2 2p6 3s2 3p6

So, electronic configuration of As in noble gas form is: [Ar] 3d10 4s2 4p3

Answer: [Ar]3d^104s^24p^3

C)

Number of electron in Sr = 38

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2

Noble gas having lesser electron than Sr and closest to it is Krypton (Kr)

Number of electron in Kr = 36

electronic configuration of Kr is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

So, electronic configuration of Sr in noble gas form is: [Kr] 5s2

Answer: [Kr]5s^2

D)

Number of electron in Sb = 51

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3

Noble gas having lesser electron than Sb and closest to it is Krypton (Kr)

Number of electron in Kr = 36

electronic configuration of Kr is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

So, electronic configuration of Sb in noble gas form is: [Kr] 4d10 5s2 5p3

Answer: [Kr]4d^105s^25p^3