Science

atoms

all matter is composed of atoms

3 subatomic particles

Protons Neutrons Electrons

What are the rings on a bohr model

energy levels

Nucleus houses

protons and neutrons

How to find the mass

protons plus neutrons

how to find neutrons

mass minus protons

Isotope symbol

mass on top left element in the middle atomic number on the bottom left

charge

protons minus electrons

atomic number

number of protons and number of element on the table

charge of a proton

\+1

charge of neutron

0

charge of electron

\-1

A equals

mass number

Z equals

atomic number

energy level 1

max 2 electrons

energy level 2

max 8 electrons

energy level 3

max 8 or 18 electrons

energy level 4

max 8 or 32 electrons

energy level 5

max 8 or 32 electrons

energy level 6

max 8 or 18 electrons

energy level 7

max 8 electrons

valence electrons

electrons in the highest energy level

Number before A

Number of valence electrons

however many rows down on table

period number

period number

number of energy levels