Atomic Structure Definitions

Question 1

Relative atomic mass

Answer 1

The relative atomic mass is the average mass of an atom of an element on a scale where an atom of carbon-12 is exactly 12

Question 2

Relative isotopic mass

Answer 2

The relative isotopic mass is the mass of an atom of an isotope of an element on a scale where an atom of carbon-12 is exactly 12

Question 3

First ionisation energy

Answer 3

The first ionisation energy is the energy needed to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous +1 ions

Question 4

Second ionisation energy

Answer 4

The second ionisation energy is the energy needed to remove an electron from each ion in 1 mole of gaseous +1 ions