Structures of Matter Flashcards
Anything that occupies space and has mass
Matter
The smallest particle of an element that has the characteristic properties of that element
Atom
The smallest subdivision of a substance having the characteristic properties of that substance
Molecule
Any material that has a definite constant composition
Substance
Most widely held theory of atomic structure is the ________
Bohr atom
The number of protons in the nucleus; symbolized by Z
Atomic number
The sum of the number of protons and neutrons in the nucleus of the atom; symbolized by A
Mass number
Atoms of the same element having different mass numbers
Isotopes
Two or more atoms with the same atomic weight (mass #) but with different atomic numbers
Isobars
Two or more atoms with the same molecular formula, but different physical and chemical properties
Isomers
Two or more atoms with the same number of neutrons but having different number of protons in the nucleus
Isotones
The energy required to remove an e- from a particular shell and beyond the range of the nucleus
Binding energy
The closer a shell is to the nucleus the ____ the binding energy
Greater
The property of elements that is determined by the number of e- in the outer shell
Chemical behavior
An atom tends to be chemically stable when its outer shell contains exactly 8 e-
Octet rule
