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Byju's Answer
Standard IX
Chemistry
Atomic Number and Mass Number
Atomicity of ...
Question

Atomicity of calcium phosphate will be

A 12

B 13

C 17

D 15

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Solution

Atomicity is the number of atoms in the molecules of an element.

Calcium Phosphate is
Ca subscript 3 left parenthesis PO subscript 4 right parenthesis subscript 2 It space consists space of space 3 space Ca space atoms 2 thin space straight P space atoms and space 4 asterisk times 2 equals 8 space straight O space atoms hence space atomicity space equals space 3 plus 2 plus 8 equals 13

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