Atoms Notes

Atom

The smallest particle of an element.

Electrical Charges

Can be Positive (+) or Negative (-).

Positive & Negative Charges

A positive & negative charge attracts each other.

Two or More Charges

Two or more positive or negative charges reject each other.

Subatomic Particles

Smaller particles of matter

Proton

A positively charged subatomic particle located inside the nucleus, defines the atomic number and element.

Proton Symbol

p+

Proton Charge

1+

Proton Mass

1.007 amu

Neutron

A neutral charged subatomic particle located inside the nucleus, contributing to its mass.

Neutron Symbol

n0

Neutron Charge

0

Neutron Mass

1.008 amu

Electron

A negatively charged subatomic particle located outside the nucleus, the flow creates electric currents.

Electron Symbol

e-

Electron Charge

1-

Electron Mass

0.00055 amu

Atomic Number

The count of protons within an atom's nucleus, defining its elemental identity

Atomic Mass

The atom’s mass rounded to its nearest whole number.

Calculating Neutrons

Number of Neutrons = Atomic Mass - Atomic Number.