20. Rumus kimia garam kalsium nitrat berikut ini adalah __ A. Ca(NO_(3))_(2) D Ca_(3)(NO_(3))_(2) B. Ca(NO_(3))_(3) E Ca_(2)(NO_(3))_(3) C. Ca_(2)(NO_(3))_(2)

Question

Answer 1

The correct answer is **A.

**. Here's why:* **Calcium (Ca)** is in group 2 of the periodic table, meaning it has a +2 charge as a cation (

).* **Nitrate (

)** is a polyatomic ion with a -1 charge (

).To balance the charges, you need two nitrate ions for every calcium ion:*

+ 2

→

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