What does the number next to isotopes signify?

Answer 1

The number next to the isotope is the mass number- They all have different masses because they have different numbers of neutrons, but the same amount of protons (Remember protons + nuetrons = mass)

Answer 2

Oh, dude, the number next to isotopes signifies the total number of protons and neutrons in the nucleus of an atom. It's like the atomic weight, but with a bit more pizzazz. So yeah, it's basically the Atomic Mass of that specific isotope. Cool, right?

Answer 3

The number next to isotopes signifies the mass number, which is the total number of protons and neutrons in the nucleus of an atom. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. The mass number helps differentiate between different isotopes of the same element.

Answer 4

The number next to an isotope is its mass number. The mass number is the sum of the protons and neutrons in the atom. All isotopes of an element have the same number of protons, but different numbers of neutrons.

Answer 5

The number next to isotopes represents the sum of the protons and neutrons in the nucleus of the atom. It is called the mass number. Isotopes of an element have the same number of protons but a different number of neutrons, leading to variations in mass number.

Answer 6

it is the mass number,for instance carbon usually has a mass of 12,but its isotope carbon-14 has 2 extra neutrons which make its mass 14

Protons plus Neutrons equals mass