sub atomic particles

what contains in nucleus

protons and neutrons

mass and charge of protons

positive charge and 1 mass

mass and charge of electrons

negative charge and 1/1836 mass

mass and charge of neutrons

no charge and 1 mass

what is the large number in a element

mass number- shows number of protons and neutrons.

(remember that same number protons is same number of electrons)

what is the small number in an element

atomic mass- shows the same number of protons and electrons.

how to find number of neutrons

mass number = atomic mass

define isotopes

where atoms have same number of protons but different numbers of neutrons

how to calcualte relative atomic mass

(mass x abundance) + (mass x abundance)

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total abundance