Chemistry - Periodic Table - Periodic trends - atomic radius - Shrinking Across, Growing Down

A counter-intuitive quiz for Grade 10-11. Q1: 'Sodium (11 protons, 11 electrons) vs Chlorine (17 protons, 17 electrons). Which atom is BIGGER?' A) Chlorine because it has more particles (wrong!), B) Sodium because its electrons are less tightly held (correct!). Q2: 'But wait - Chlorine has MORE elec