Atomic Theory

what is the atomic number

the protons in an atom ( this also gives electrons

what is the mass number

the number of protons and neutrons added together in the atom

what is top and what is bottom

mass number is the top number and atomic number is the bottom number

electron relative mass

1/1840

electron relative charge

-1

electron where it is found

shells

proton relative mass

1

proton relative charge

+1

proton where it is found

nucleus

neutron relative mass

1

neutron relative charge

+1

neutron where is it found

nucleus

period table groups 1

alkali metals

group 2

alkaline metals

group 7

halogens

group 8/0

noble gases

hydrogen

h

Helium

He

Lithium

Li

Berilium

Be

Boron

B

carbon

C

nitrogen

N

oxygen

O

florine

F

Neon

Ne

Sodium

Na

magnesium

Mg

aluminium

Al

silicon

SI

phophorus

P

Sulfur

S

Clorine

Cl

Argon

Ar

potassium

K

Calcium

Ca

first circle how many x

2

rest of circles

8 x’s