What is the formula for calcium?

The formula for the calcium ion is Ca²⁺.

Calcium, in its elemental form, is represented by the symbol Ca. The reference provided only mentions the ionic form of calcium. When calcium loses two electrons, it forms a positively charged ion, hence Ca²⁺.

Here's a breakdown:

• Ca: This is the chemical symbol for the element calcium.
• Ca²⁺: This is the formula for the calcium ion, also known as a cation, indicating that it has lost two electrons and has a +2 charge. The reference mentions "The formula of the calcium ion is Ca²⁺...".

The provided reference also mentions related chemical formulas:

• The acetate ion, which has a formula of CH₃COO^-.
• The need to know the formula of calcium acetate. The final formula for calcium acetate is Ca(CH₃COO)₂.
• The question on what is the formula for Calcium Bisulfate. Calcium bisulfate has the formula Ca(HSO4)2.

In summary:
| Substance | Formula |
| :----------- | :------- |
| Calcium (element) | Ca |
| Calcium ion | Ca²⁺ |