Answer:
Explanation:
Lead:
Lead is present in period six. It has 6 energy level.
Electronic configuration is:
Pb₈₂ = [Xe] = 4f¹⁴ 5d¹⁰ 6s² 6p²
Arsenic:
Arsenic is present in period 4. It has 4 energy level.
Electronic configuration is:
As₃₃ = [Ar] 3d¹⁰ 4s² 4p³
Helium;
It is present in period 1. it has one energy level.
Electronic configuration is:
He₂ = 1s²
Barium:
It is present in period six. It has six energy level.
Electronic configuration is:
Ba₅₆ = [Xe] 6s²
Yttrium
It is present in period five. It has five energy level.
Electronic configuration is:
Y₃₉ = [Kr] 4d¹ 5s²
Magnesium
it is present in period 3. it has three energy level.
Electronic configuration is:
Mg = [Ne] 3s²
Neon
it is present in second period. it has two energy level.
Electronic configuration is:
Ne₁₀ = [He] 2s² 2p⁶
Plutonium
It is present in period seven. It has seven energy level.
Electronic configuration is:
Pu₉₄ = [Rn] 5f⁶ 7s²
