PTAtomReview

ELEMENT

• Unique atomic number
• Unique atomic mass number
• Made up of only one unique type of atom
• Symbol consists of 1 or 2 letters

PROTON

• Positive charge
• Found in nucleus

NEUTRON

• Neutral charge
• Found in the nucleus

ELECTRON

• Negative charge
• Moves outside the nucleus
• Smaller mass than neutral/proton

ATOMIC NUMBER

• Number of protons in the nucleus of an atom
• Used to identify element (each element has a different number)

ISOTOPES

• An atom with a different number of neutrons
• Can be identified by the atomic mass number

ATOMIC MASS NUMBER

• Amount of neutrons and protons found in an atom
• Used to identify an isotope

IONS

• Atoms with different numbers of electrons
• Anion is gaining a negative (charge)
• Cation is losing a negative (positive charge)