Question

1. 3cacl2 # of molecules: 3 # of elements: name of element: # of atoms: 3 6 total # of atoms: 9 the #3 is a coefficient (coefficient or subscript)

Explanation:

Step1: Identify elements

The elements in $3CaCl_2$ are calcium (Ca) and chlorine (Cl), so the number of elements is 2.

Step2: Determine atom - counts for each element

For calcium (Ca), the sub - script is 1 (implied when not written) and the coefficient is 3. So the number of Ca atoms is $3\times1 = 3$. For chlorine (Cl), the sub - script is 2 and the coefficient is 3. So the number of Cl atoms is $3\times2=6$.

Answer:

of elements: 2

Name of element: Calcium, Chlorine

of atoms (Ca): 3

of atoms (Cl): 6

Total # of atoms: 9
The #3 is a coefficient