Answer:
CO2(g)
Because CO2 is the larges molecule with specific geometric, therefore it is not likely to behave as an ideal gas.
Metallic ion because the metallic ions will enter an exited state and release photons energy, in the form of light, as they return to their ground state.
Here’s the answer to your question :)
Mass number = number of protons + number of neutrons
number of protons = atomic number =7
number of neutrons= mass number - number of protons=16-7=9
Answer is B.9.
