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question 2

Explanation:

group 13 boron group valence electrons:3

group 14 carbon group valence electrons: 4

group 15 pnictogens valence electrons: 5

group 16 chalcogens valence electrons: 6

question 7

hydrogen and helium

question 6

magnesium, calcium, barium, beryllium, strontium, radium, lithium, caesium, rubidium, francium, indium, scandium

question 1

sodium, lead, tin, mercury

question 3

hydrogen

helium

lithium

beryllium

question 4

beryllium

carbon

nitrogen

question 5

hydrogen - 1

hydrogen- 2

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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c.

explanation: