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.

the answer would be b i believe

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.