How is the relatively high melting point of sodium chloride related to its structure at the atomic scale? Observe
sodium chloride crystals with a hand lens. Use your observations
and the model of sodium chloride to support your claim.

you need to give more information

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

explanation: no but i do not usually comment