Ordforklaringer kapittel 1-4

Question 1

Relative atomic mass, Ar

Answer 1

is the weighted average mass of the naturally occurring isotopes of the element relative to the mass of an atom of Carbon - 12

Question 2

Relative isotopic mass

Answer 2

refers to the mass of a specific isotope

Question 3

Relative molecular mass, Mr

Answer 3

is the mass of a molecule relative to the mass of an atom of Carbon-12, which is given the exact mass of 12

Question 4

Nucleon number

Answer 4

number of protons + number of neutrons

Question 5

Isotope

Answer 5

atoms with the same atomic number but different nucleon number. They only differ in the number of neutrons they contain

Question 6

Atomic number

Answer 6

is the number of protons found in the nucleus of an atom and it is identical to the charge number of the nucleus

Question 7

Ionisation energy

Answer 7

the energy needed to remove 1 mole of electrons from 1 mole of atoms of an element in the gaseous state to form 1 mole of gaseous ions

Question 8

Lone pairs

Answer 8

pairs of electrons in the outer shell of an atom that are not bonded

Question 9

Molar mass

Answer 9

the mass of a mole of substance in grams

Question 10

Electronegativity

Answer 10

is a measure of the tendency of an atom to attract a bonding pair of electrons

Question 11

Bond enthalpy

Answer 11

is the energy required to break one mole of the given bond in the gaseous molecule