physics radiation

Atoms

-have a radius of about 1x10^-10

-have a positively charged nucleas surrounded by negative electrons

-the radius of a nucleas is less than 1/10 000 the radius of an atom

What are the two ways electrons can change energy levels

1, absorption of electromagnetic radiation (moving the electrons further from the nucleas or a higher energy level)

2, emission of electromagnetic radiation (moving closer to the nucleas or a lower energy level)

In an atom what is the number of protons equal to ?

The number of electrons

This is because atoms have no charge

What is an isotope

Where an atom of an element have different numbers of neutrons

(Atoms of the same element all have the same number of protons)

What is the atomic number

The number of protons in an atom of an element

What is the mass number

The total number of protons and neutrons in an atom

How do atoms become ions

By losing electron(s) or gaining electron(s) and possessing a full outer shell