What are the orbital box diagrams of the selected elements?

_{a) 3}Li

b) ₈O

c) ₁₂Mg

d) ₁₅ P

_{a) 3}Li          1s(↑↓) 2s(↑)

b) ₈O         1s(↑↓) 2s(↑↓) 2p(↑↓)(↑ )(↑ )

c) ₁₂Mg      1s(↑↓) 2s(↑↓) 2p(↑↓)(↑↓)(↑↓) 3s(↑↓)

d) ₁₅ P       1s(↑↓) 2s(↑↓) 2p(↑↓)(↑↓)(↑↓) 3s(↑↓)

                    3p(↑ )(↑ )(↑ )

What are the abbreviated noble-gas core electron configurations for the following:

a) ₃Li            1s¹2s¹                    or

b) ₈O            1s¹2s²2p⁴                  or

c) ₁₂Mg         1s¹2s²2p⁶3s²           or

d) ₁₅ P          1s¹2s²2p⁶3s²3p³      or

a) ₃Li            [He]2s¹

b) ₈O            [He]2s²2p⁴

c) ₁₂Mg         [Ne]3s²

d) ₁₅ P          [Ne]3s²2p³

Z = 19 (Z = atomic number)

1s²2s²2p⁶3s²2p⁶4s¹

[Ar]4s¹

Z = 17 (Z = atomic number)

1s²2s²2p⁶3s²3p⁵

n = 3

l = 1

m_l = -1, 0, +1

m_s = +1/2, -1/2

What is the electron configuration of the following?

a) ₄Be

b) ₁₅P

c) ₃₅Br

d) ₄₉In

e) ₅₅Cs

a) ₄Be     [He]2s²

b) ₁₅P     [Ne]3s²3p³

c) ₃₅Br     [Ar]4s²3d¹⁰4p⁵

d) ₄₉In    [Kr]5s²4d¹⁰5p¹

e) ₅₅Cs    [Xe]6s¹

a half filled shell is more stable than one that is more or less than half-filled.

the 2 exceptions are:Cr and Cu

₂₄Cr     [Ar]4s¹3d⁵

₂₉Cu    [Ar]4s¹3d¹⁰

Which of the following are isoelectronic?

a) Na⁺

b) Mg²⁺

c) Al³⁺

d) F^-

e) O^2-

f) N^3-

g) P^3-

h) Ca²⁺

i) S^2-

j) Cl^-

k) Ar

l) Ne

a) Na⁺, b) Mg²⁺, c) Al³⁺, d) F^-, e) O^2-, f) N^3-, l) Ne = [Ne]

h) Ca²⁺, g) P^3-, i) S^2-, j) Cl^-, k) Ar = [Ar]

Which element has the largest atomic radius?

a) Cs

b) Rn

c) K

d) Br

Arrange the following in order of increasing ionic radius

N^3-, Mg²⁺, Na⁺, F^-, O^2-, Al³⁺