Question

1. pb(no3)2 # of molecules: 1 # of elements: 3 name of element: # of atoms: 1 2 6 total # of atoms: 9 the #3 is a (coefficient or subscript)

Explanation:

Step1: Identify elements

The elements in $Pb(NO_3)_2$ are lead (Pb), nitrogen (N), and oxygen (O).

Step2: Count atoms of each element

• For lead (Pb), there is 1 atom as there is no sub - script next to Pb, so number of Pb atoms = 1.
• For nitrogen (N), since there is a sub - script 2 outside the parentheses and 1 N inside the parentheses, number of N atoms = 2×1 = 2.
• For oxygen (O), with a sub - script 3 inside the parentheses and 2 outside the parentheses, number of O atoms = 2×3=6.

Step3: Determine the nature of 3

The 3 in $NO_3$ is a subscript as it indicates the number of oxygen atoms in the nitrate ion $NO_3$.

Answer:

Name of element: Lead, Nitrogen, Oxygen
The #3 is a subscript