Question

how many electrons are in a neutral element of calcium? *
20
19
21
22

how many protons are in the element fluorine? *
16
9
6
10

Explanation:

First Question: How many electrons are in a neutral element of Calcium?

In a neutral atom, the number of electrons is equal to the number of protons, which is the atomic number. The atomic number of Calcium (Ca) is 20. So, a neutral Calcium atom has 20 electrons.

The number of protons in an atom is equal to its atomic number. The atomic number of Fluorine (F) is 9. So, Fluorine has 9 protons.

Answer:

A. 20

Second Question: How many protons are in the element Fluorine?