ATOMS

Atom

The atom is the smallest part of an element. They make up everything.

Charge of Proton

Positive

Mass of Proton

1 a.m.u.

Location of Proton

Nucleus

Change of Neutron

Neutral

Mass of Neutron

1 a.m.u.

Location of Neutron

Nucleus

Charge of Electron

Negative

Mass of Electron

1/1840 a.m.u. (negligible)

Location of Electron

Shells/Orbits

A.M.U.

Atomic Mass Unit

Electronic Configuration

How electrons are arranged

Element in Periodic Table

A - Atomic Number, B - Mass Number, C - Chemical Symbol

The smaller number

Is always the atomic number

The number of protons is the same as the

Number of electrons

Maximum in first shell

2

Maximum in second shell

8

Maximum in third shell

18

Maximum in fourth shell

32

Maximum in fifth shell

50

Atomic Number

Number of protons in an atom

Atomic Mass Number

Number of protons + neutrons in atom