Question

What is the composition of an isotope of calcium (atomic number 20)?

21 protons, 20 neutrons, 20 electrons


20 protons, 25 neutrons, 20 electrons


22 protons, 20 neutrons, 19 electrons


19 protons, 20 neutrons, 19 electrons

Answer 1

Answer:

The second one

Explanation:

Because the isotopes have the same number of protons and different number of neutrons compared with the original element