If the American system is the same, group on should be alkali metals and the answer would be frankium
The valence electron configuration for antimony (Sb) is:
Sb = 5s²5p³5d⁰
In SbCl₅²⁻, antimony has a -2 charge i.e. it has 2 additional electrons
Sb²⁻ = 5s²5p⁵5d⁰
Following a two electron transition from p→d orbital we have:
Sb²⁻ = 5s²5p³5d²
There is a total of 5 unpaired electrons (3 in the p and 2 in the d) which can form five bonds with the 5 Cl atoms.
Thus the hybridisation of Sb in SbCl₅²⁻ is sp³d²
We can use any solution containing chloride ions as NaCl solution or even dilute HCl due to mercurous Hg₂²⁺ is from group I cations which precipitated as chloride while Sr²⁺ is from group V
Net ionic equation:
Hg₂²⁺ + 2 Cl⁻ → Hg₂Cl₂ (white precipitate)
while SrCl₂ is soluble salt<span />
Answer:
Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.