Question

how many protons are in a neutral atom of calcium? how many electrons? number of protons = \boxed{} number of electrons = \boxed{}

Explanation:

Step1: Recall atomic structure rules

In a neutral atom, the number of protons equals the atomic number, and the number of electrons equals the number of protons (since the atom is neutral, positive charge from protons equals negative charge from electrons).

Step2: Determine atomic number of calcium

The atomic number of calcium (Ca) is 20. So, number of protons = 20.

Step3: Determine number of electrons

Since the atom is neutral, number of electrons = number of protons = 20.

Answer:

Number of protons = 20
Number of electrons = 20