Atomic Structure

Question 1

Definition of relative atomic mass?

Answer 1

mean mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12

Question 2

first ionisation energy?

Answer 2

energy needed to remove 1 mole of electrons from 1 mole of atoms to form 1 mole of gaseous ions with a positive charge

Question 3

Pattern of ionisation energies down a group?

Answer 3

decrease down a group as extra electron shells provide shielding and the outer electrons are further from the nucleus with less attraction

Question 4

pattern of atomic radius along a period?

Answer 4

decreases across a period as the positive charge of the nucleus increases

Question 5

pattern of ionisation energy across a period?

Answer 5

increases along a period as there is a stronger nucleic attraction
there’s little extra shielding