In Chemistry how do you work out the number of neutrons using a periodic table?

Question

For example. If you were given a table to fill in with the Particle name being Ar for Argon, the atomic number being 18 and the mass number being 40, how would you work out the number of neutrons in that particle?

Answer 1

Neutrons = atomic mass - atomic number

Answer 2

For Ar, the number of neutrons = 40 - 18 = 12
because the atomic number refers to the number of protons and the mass number referes to the number of protons and neutrons in the nucleus.

Answer 3

To find the number of neutrons of an element on the periodic table minus the atomic number from the atomic mass.

Becareful of isotopes.

Answer 4

the number of protons and neutrons are the same. which are also the same as the atomic number. Argon has 18 neutrons and protons

Answer 5

Mass - Protons = Neutrons

Answer 6

Using it's atomic mass, subtract the protons, and you'll get the neutrons.

Answer 7

searching on the periodic table contained in the sq. with the tremendous 56 and the emblem Ba, so that you've the emblem, Ba, the shape of protons is an same because the atomic volume, 56, the shape of electrons is likewise an same because the atomic volume, 56 and the mass volume is the small volume interior an same sq., accordingly, 137.33 atomic mass instruments.

Answer 8

Round the atomic mass and subtract the atomic number.

Answer 9

the mass number minus the atomic number, in your example 22

Answer 10

simply
mass=protons+neutrons
where number of protons is atomic number and atomic mass is nuber of neutrons and protons, so
neutrons=mass-protons