Amount of substance - definitions Flashcards
1
Q
Valency
A
The number of bonds which that atom forms in the compound. The valency of an ion in an ionic compound is equal to the charge on the ion.
2
Q
Relative atomic mass (Ar)
A
The average mass of an atom on a scale where an atom of carbon-12 weighs exactly 12
3
Q
Relative molecular mass (Mr)
A
The average mass of a molecule on a scale where an atom of carbon-12 weighs exactly 12
4
Q
Relative formula mass (Mr)
A
The average mass of a formula unit on a scale where an atom of carbon-12 weighs exactly 12
5
Q
Atom
A
The smallest part of an element that retains the properties of that element
6
Q
Empirical formula
A
The simplest ratio of atoms of each element in a compound
7
Q
Molecular formula
A
The actual number of atoms of each element in a compound
