group number of fuorine
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They all have 7 valence electrons (hence group 7!) in their outer shell (insert diagram or prop to show what the outer shell signifies). ... Fluorine has a higher electronegativity than Chlorine because it has one shell less than Chlorine.
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Fact box
Group 17 −219.67°C, −363.41°F, 53.48 K
Period 2 −188.11°C, −306.6°F, 85.04 K
Block p 0.001553
Atomic number 9 18.998
State at 20°C Gas 19F
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