Question

An isotope contains 20 protons, 18 electrons, and 20 neutrons. What is the identity of the isotope?

Answer 1

Answer:

Calcium

Explanation:

Number of protons = 20. This is also the atomic number.

The element with atomic number 20 is Calcium.

Number of electrons = 18

In a neutral atom, number of protons = number of electrons

Here, number of protons is 2 less than number of electrons. Therefore the ion formed is Ca 2+.