Question

Which is more covalent among CaCl2 and hgCl2 and why?

Answer 1

Answer:

HgCl2

Explanation:

Both Hg2+ and Ca2+ are almost of the same size. So in such cases, where the cations have similar charge and size, we compare their electron configuration. The one with pseudo inert gas configuration (the shell with the highest energy level has 18 electrons instead of 8 electrons) will have more covalent character.

electronic configuration of Hg2+ is [Xe] 4f14 5d10 6s0

electronic configuration of Ca2+ is  1s2 2s2 2p6 3s2 3p6

Hg2+ has pseudo-inert gas configuration. Meanwhile Ca2+ ion has a noble gas configuration. So,HgCl2 will be more covalent than CaCl2.

Answer 2

Answer:

HgCl2 is more covalent .

Explanation:

HgCl2-

1) Mercury(II) chloride (or mercury bichloride, mercury dichloride), historically also known as sulema or corrosive sublimate

2) It is the inorganic chemical compound of mercury and chlorine with the formula HgCl2.

3)It is white crystalline solid and is a laboratory reagent

CaCl2-

1) Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2.

2) It is a white crystalline solid at room temperature, and it is highly soluble in water

FINAL ANSWER- HgCl2 is more covalent .

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