For the a groupse (groups 1a to 8a) how does the group number relate to the electron arrangement in atoms of the group

the group number is equal to the number of valance electrons

good luck!

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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