1.1 Flashcards
Two or more forms of the same element, in the same physical state, with different chemical structures
Allotrope
The smallest particle of an element that has the properties of that element and can enter into a chemical combination
Atom
Average mass of atoms of an element, expressed in amu
Atomic Mass
The Avogadro constant is an explicit unit of “per mole,” a conveniently rounder version being 6.022*10^23/mol
Avogadro’s Number
Pure substance that can be decomposed into two or more elements
Compound
Substance that is composed of a single type of atom; a substance that cannot be decomposed by a chemical change
Element
Formula showing the composition of a compound given as the simplest whole-number ratio of atoms
Empirical Formula
Sum of the numbers of neutrons and protons in the nucleus of an atom
Mass Number
The Mass in grams of 1 mole of that substance, a property expressed in units of grams per mole (g/mol)
Molar Mass
An amount unit similar to familiar units like pair, dozen, gross, etc.; it provides a specific measure of the number of atoms or molecules in a sample of matter
mole
Formula indicating the composition of a molecule of a compound and giving the actual number of atoms of each element in a molecule of the compound
Molecular Formula
Bonded collection of two or more atoms of the same of different elements
Molecule