Explanation:
oxygen has a negative charge
sodium has a positive charge
opposites attract
That they are different.. because they have the same mass but different densities
Answer:
"Heat of combustion"
Explanation:
A physical property is characteristic of a substance that can be observed or measured without changing its chemical composition, such as color, molecular weight, and volume. A chemical property can only be observed or measured by changing the chemical composition of the substance, such as reactivity, flammability and oxidation states.
Hope this helps! :)
Answer:
Because of the existence of isotopes.