Question

c.) bromine
symbol:
total # of electrons: (hint: in a neutral atom electrons = protons)
electron configuration:

d.) nickel
symbol:
total # of electrons: (hint: in a neutral atom electrons = protons)
electron configuration:

e.) rhodium
symbol:
total # of electrons: (hint: in a neutral atom electrons = protons)
electron configuration:

f.) actinium
symbol:
total # of electrons: (hint: in a neutral atom electrons = protons)
electron configuration:

g.) beryllium
symbol:
total # of electrons: (hint: in a neutral atom electrons = protons)
electron configuration:

h.) mercury
symbol:
total # of electrons: (hint: in a neutral atom electrons = protons)

Explanation:

Step1: Recall element symbols

Use periodic - table knowledge to find symbols.

Step2: Determine electron number

Atomic number = number of protons = number of electrons in neutral atom.

Step3: Write electron configuration

Follow Aufbau principle, Pauli - exclusion principle, and Hund's rule.

Answer:

C. Bromine:
Symbol: Br
Total # of Electrons: 35
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
D. Nickel:
Symbol: Ni
Total # of Electrons: 28
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d⁸
E. Rhodium:
Symbol: Rh
Total # of Electrons: 45
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹4d⁸
F. Actinium:
Symbol: Ac
Total # of Electrons: 89
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²6d¹
G. Beryllium:
Symbol: Be
Total # of Electrons: 4
Electron Configuration: 1s²2s²
H. Mercury:
Symbol: Hg
Total # of Electrons: 80
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰