How many protons neutrons and electrons are in an atom of calcium-42?

Answer 1

Calcium has atomic number 20, which means that all calcium atoms have 20 protons in their atomic nuclei. Neutral calcium atoms also have 20 electrons. Isotopes of calcium vary in the number of neutrons in their atomic nuclei, and are named for their mass number, which is the sum of the protons and neutrons in the nucleus. You can calculate the number of neutrons (N) in an isotope by subtracting the number of protons (atomic number) from the mass number. N = 42 - 20 = 22, therefore, a calcium-42 isotope has 20 protons, 20 electrons, and 22 neutrons.

Answer 2

An atom of calcium-42 has 20 protons, 22 neutrons, and 20 electrons. The number of protons, which is 20 in this case, determines the element, while the sum of protons and neutrons gives the Atomic Mass of 42.

Answer 3

An atom of calcium-42 has 20 protons, as calcium has an atomic number of 20. Since the atomic number represents the number of protons in an atom, calcium always has 20 protons. Calcium-42 also has 22 neutrons, calculated by subtracting the atomic number from the atomic mass (42 - 20 = 22). The number of electrons in a neutral atom is equal to the number of protons, so a calcium-42 atom would have 20 electrons.

Answer 4

Calcium-42 has 20 protons and electrons and 22 neutrons.

Answer 5

42 total mass -20 protons = 22 neutrons

Answer 6

22.

Answer 7

20