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<em>15. Metallic bonds form between?</em>
Answer 15 : cations and electrons.
<em>16. What is the formula for lithium nitride?</em>
Answer 16 : Li₃N
<em>17. Which type of solid is likely to be the best conductor of electricity?</em>
Answer 18 : metal element.
<em>18. When an atom gains an electron, it forms a?</em>
Answer 18 : an anion.
<em>19. Mg₃P₂ - Which element is the cation? </em>
Answer 19 : Mg⁺⁺
<em>20. Which of the following has the highest melting point?</em>
Answer 20 : metallic compound.
<em>21. What statement is true about carbon-12 and carbon-14?</em>
Answer 21 : They are isotopes of carbon.
<em>22. What is the name of the phase change that occurs when a substance changes from a gas to a liquid?</em>
Answer 22 : Condensation
Hope this helps!