1.2 atomic structure

Question 1

atomic number

Answer 1

the number of protons in (the nucleus of) an atom

Question 2

mass number

Answer 2

the total number of protons and neutrons in (the nucleus of) an atom

Question 3

relative atomic mass (RAM)

Answer 3

the average (weighted mean) mass of an atom of an element relative to the mass of one-twelth of the mass of an atom of carbon-12

Question 4

relative isotopic mass (RIM)

Answer 4

the average (weighted mean) mass of an isotope of an element relative to one-twelth of the mass of an atom of carbon-12

Question 5

isotopes

Answer 5

atoms which have the same atomic number but a different mass number (contain the same number of protons but a different number of neutrons)

Question 6

relative formula mass (RFM)

Answer 6

the average (weighted mean) mass of a formula unit relative to one-twelth of the mass of an atom of carbon-12

Question 7

relative molecular mass (RMM)

Answer 7

the average (weighted mean) mass of a molecule relative to one-twelth of the mass of an atom of carbon-12

Question 8

first ionisation energy

Answer 8

the energy required to convert one mole of gaseous atoms into gaseous ions with a single positive charge

Question 9

second ionisation energy

Answer 9

the energy required to convert one mole of gaseous ions with a single positive charge into gaseous ions with a double positive charge

Question 10

third ionisation energy

Answer 10

the energy required to convert one mole of gaseous ions with a double positive charge into gaseous ions with a triple positive charge

Question 11

orbital

Answer 11

a region within an atom that hold up to two electrons, spinning in opposite directions to minimise replusion