Question

Plz answer th 21st one plz I need it urgent

Answer 1

a. 1) copper- solid (26°c)

2) Helium- gas (26°c)

3) Carbon - solid (26°c)

4) Water - liquid (26°c)

b. Carbon because the strongest substance in the world. because there is a strong force of attraction force between the carbon particles.

c.helium gas because it's a gas at room temperature.as we know gas particles are loosely packed, so they have weak force of attraction.

Answer 2

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