Question

name: date: period counting atoms task cards directions: using the chemical formula cards, count the number of atoms for each element in the formula. then calculate the total number of atoms in each formula. 14 ca(no₃)₂

Explanation:

Step1: Count Ca atoms

No subscript, so count = 1

Step2: Count N atoms

Subscript outside parenthesis: $2$, so count = $1 \times 2 = 2$

Step3: Count O atoms

Subscript inside parenthesis: $3$, times outer subscript: $3 \times 2 = 6$

Step4: Calculate total atoms

Sum all element counts: $1 + 2 + 6$

Answer:

• Ca: 1 atom
• N: 2 atoms
• O: 6 atoms
• Total atoms: 9