Which of the following atoms is least likely to form chemical bonds with other atoms
a. a hydrogen containing 1 valence electron
b. a carbon atom containing 4 valence electrons
c. a neon containing 4 valence electrons
d. a sodium atom containing 1 valence electron

The atom that would least likely form chemical bonds with other atoms would be C. A neon containing 4 valence electrons, this is because neon itself is an inert gas, it would not necessarily react as it already possess the maximum number of electrons needed to achieve stability and have a full octet, even if it is forced to obtain 4 valence electrons it would not react with other atoms.

2. they have negligible mass.

Texture and composition are different because they are not the same aspect. texture has to do with feel and so on, where as composition is the chemical makeup which you cant touch like you can texture.