Quick Notes

Atomic structure:

• The development of atomic structure is said to have begun when John Dalton introduced the Atomic Theory

• Dalton's Atomic Theory states that atoms are the smallest particles and there are three subatomic particles that make up an atom, namely protons, neutrons, and electrons

Ion formation:

• Ions are formed when atoms lose (positive ions) or receive electrons (negative ions)

• Positive ions are formed when atoms lose electrons. So a positive ion has more protons than its number of electrons

• Negative ions are formed when atoms receive electrons. Thus, a negative ion has more electrons than its number of protons