Atoms Vocab

Front

ATOM: The smallest _____ of matter that retains all properties of the element.

Back

unit

Front

ATOMIC MASS UNIT: An SI unit (amu), equal to 1.66 x 10 −24 g, almost the mass of 1 ________ or ________ for measuring the _______ of atoms.

Back

proton neutron mass

Front

ATOMIC NUMBER: The number of _______ in an atom. A different atomic number defines each ______.

Back

protons element

Front

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

Back

atoms

Front

CHEMICAL BOND: When two or more ______ share some of their ______. This binds them into a molecule.

Back

atoms electrons

Front

ELEMENT: A substance made of one kind of ______.

Back

atom

Front

ELECTRON: A negatively charged particle in an atom. Has almost no ____ and is the only part active in ________ reactions.

Back

mass chemical

Front

NEUTRON: A subatomic particle with ___ electric charge. Mass slightly higher than a ________. Important in radioactivity.

Back

0 proton

Front

PROTON: A _______ charged particle in an atom. The number of ___ in the nucleus decides the element. This is the atomic number.

Back

positively protons

Front

ATOMIC MASS: The mass of a single ______ of an element. Measured in ______ _______ _______.

Back

atom atomic mass units