Use Lewis symbols to show electron transfer between the following atoms to form cations and anions :
Ca and O

Explanation

To solve the problem of showing electron transfer between calcium (Ca) and oxygen (O) using Lewis symbols, we will follow these steps:

### Step 1: Determine the Valence Electrons
- **Calcium (Ca)** has an atomic number of 20, and its electron configuration is 2, 8, 8, 2. This means it has 2 valence electrons in its outermost shell.
- **Oxygen (O)** has an atomic number of 8, and its electron configuration is 2, 6. This means it has 6 valence electrons in its outermost shell.

### Step 2: Draw the Lewis Symbols
- For **Calcium (Ca)**, we represent the 2 valence electrons as dots around the symbol:
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