Which of the following most likely has neither a fixed shape nor a fixed

neon gas

solid copper

liquid nitrogen

liquid mercury

neon gas

Explanation: Matter is classified into three main categories:

a) Solids: have fixed size and volume . They have strongest forces of attraction.

b) Liquids: have fixed volume but no fixed shape. They acquire the shape of the container. They have intermediate forces of attraction.

c) Gases: have no fixed shape and no fixed volume. They occupy complete volume of the container. They have weakest forces of attraction.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms