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What is the chemical formula of calcium chloride?
A. [tex]CaCl[/tex]
B. [tex]Ca_2Cl_2[/tex]
C. [tex]Ca_2Cl[/tex]
D. [tex]CaCl_2[/tex]

Sagot :

GinnyAnswer
To determine the correct chemical formula for calcium chloride, let's consider the valences of the elements involved:

1. Calcium (Ca) is in Group 2 of the periodic table, which means it has a valence of +2.
2. Chlorine (Cl) is in Group 17 of the periodic table, which means it has a valence of -1.

When calcium (Ca) bonds with chlorine (Cl) to form calcium chloride:

- One calcium atom, with a +2 charge, needs to be balanced by two chloride ions, each with a -1 charge.
- The formula thus needs to reflect that two Cl atoms are required to balance out the charge of one Ca atom.

Therefore, the correct chemical formula is [tex]\( CaCl_2 \)[/tex].

Thus, the correct answer is:
D. [tex]\( CaCl_2 \)[/tex]
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