Question

count the atoms! ga(clo4)3

Explanation:

Step1: Identify Ga atoms

There is 1 Ga atom as there is no sub - script next to Ga.

Step2: Identify Cl atoms

The sub - script 3 outside the parentheses multiplies the Cl atom inside. So, there are 3 Cl atoms ($1\times3$).

Step3: Identify O atoms

The sub - script 4 for O is inside the parentheses and 3 is outside. So, there are 12 O atoms ($4\times3$).

Step4: Calculate total atoms

Add the number of each type of atom: $1 + 3+12=16$ atoms.

Answer:

16