Golden Definitions

Question 1

Empirical formula

Answer 1

Simplest whole number ratio of atoms of each element in a compound

Question 2

Molecular formula

Answer 2

Number and type of atoms present in a compound

Question 3

Atomic number

Answer 3

Number of protons (or electrons in an element)

Question 4

Mass number

Answer 4

Number of protons + neutrons

Question 5

Isotopes

Answer 5

Atoms of the same element with different numbers of neutrons

Question 6

Relative atomic mass

Answer 6

Average mass of an element relative to 1/12th the mass of a carbon-12 atom

Question 7

Relative isotopic mass

Answer 7

Mass of an isotope relative to 1/12 the mass of a carbon-12 atom

Question 8

m/z

Answer 8

mass : charge

Question 9

Amount of substance

Answer 9

Means of counting atoms

Question 10

Molar mass

Answer 10

Mass per mole of substance in g mol-1

Question 11

Mole

Answer 11

Amount of substance which contains the same number of particles as carbon atoms in 12g of carbon-12

Question 12

Element

Answer 12

Contains only one type of atom

Question 13

Compound

Answer 13

At least 2 different types of atom chemically bonded together

Question 14

Mixture

Answer 14

At least 2 different types of atom not chemically bonded togetherA

Question 15

Atom

Answer 15

Smallest part of an element that still has properties of that element

Question 16

Molecule

Answer 16

2 or more atoms chemically bonded together

Question 17

Ion

Answer 17

Atom or molecule with a net electric charge