Which atoms are likely to form chemical bonds with other atoms
a. hydrogen
b. neon
c. sodium
d. helium
e. carbon
f. chlorine
or all of them above

All atoms of their respective elements are capable of forming chemical bonds with other atoms, except B. Neon, this is because neon has a stable octet, it already posses 8 valence electrons in its valence shell and thus does not need to transfer or share electrons to achieve stability.

Temperature and pressure

High-energy and unstable.