I want to say addition. But I have a tendency to be wrong
Answer:
The right answer is C. The molecules of solid CO2 are much closer together than the molecules of CO2 gas.
It has 49 electrons as well. The amount of protons and electrons are equal.
Answer: Number of protons and number of valance electrons.
Explanation:
There are three factors which determine metallic bond strength. greater the no of protons, greater will be attraction between nucleus and valance shell electrons and stronger will be metallic bond. greater no of valance electron, greater will be attractions between nucleus and electrons and stronger will be bond.