(b) Element Y forms an lonic compound with calcium. i. Give the chemical formula of the compound of calcium with $$ Y $$.

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To determine the chemical formula of the ionic compound formed between calcium (Ca) and element Y, we need to know the charge of the ions formed by both elements.

1. **Calcium (Ca)**: Calcium is an alkaline earth metal and typically forms a $$ +2 $$ charge ion (Ca$$^{2+}$$).

2. **Element Y**: Since the specific element Y is not provided, we will assume it is a non-metal that typically forms a $$ -2 $$ charge ion (Y$$^{2-}$$). This is common for elements like oxygen (O) or sulfur (S).

Given these charges, the formula for the ionic compound is determined by balancing the total positive and negative charges.

- The calcium ion has a charge of $$ +2 $$.
- The Y ion has a charge of $$ -2 $$.

To balance the charges, we can combine one calcium ion with one Y ion:

$$
\text{Ca}^{2+} + \text{Y}^{2-} \rightarrow \text{CaY}
$$

Thus, the chemical formula of the compound formed between calcium and element Y is:

$$
\text{CaY}
$$
The chemical formula of the compound formed between calcium and element Y is CaY.

(b) Element Y forms an lonic compound with calcium. i. Give the chemical formula of the compound of calcium with \( Y \).

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