Atomic Theory Vocab

Front

ATOM: Smallest unit of matter retaining all the __________ and __________ properties of the element.

Back

Chemical and physical

Front

SI unit (amu) = 1.66 x 10⁻²⁴ g, mass of 1 proton/neutron.

Back

ATOMIC MASS UNIT

Front

Mass of a single atom of an element, measured in atomic mass units.

Back

ATOMIC MASS

Front

Number of protons in an atom's nucleus defining the element.

Back

ATOMIC NUMBER

Front

MOLECULE: A group of atoms, joined by chemical bonds.

Back

ATOMS

Front

CHEMICAL BOND: Atoms share _________ to form a molecule.

Back

ELECTRONS

Front

ELECTRON: A negatively charged particle in an atom with almost no mass, active in chemical reactions.

Back

negatively, mass

Front

NEUTRON: A subatomic particle with 0 electric charge, mass slightly higher than a proton, important in radioactivity.

Back

0, proton

Front

PROTON: A positively charged particle in an atom. The number of protons in the nucleus determines the element. This number is called the atomic number.

Back

positively, element

Front

Atom with different atomic mass due to varying neutrons:

Back

ISOTOPE