Atom and It's Structure

The 'building blocks' of all matter.

Composed of three subatomic particles.

• Protons
• Neutrons
• Electrons

Nucleus: protons and neutrons bound in the centre - contains most of the atom's mass.

Subatomic particles in the nucleus are referred to as Nucleons.

Protons and neutrons are almost ideantical in mass.

Electrons are 1800 times smaller than the nucleons.

Mass number = Protons + Neutrons

Atomic number = Number of protons

Number of protons = number of electrons.

Protons: 13

Electrons: 13

Neutrons: 27 - 23 = 14

Atoms that have the same number of protons but different number of neutrons (therefore different mass numbers).

• _{The average atomic mass of elements is the average of all of its isotopes, this is the reason why its a decimal value.}

Carbon-14 is radioactive