Answer:
Isotopes
Answer:
The number of neutrons can vary, but not protons. This is called an isotope. An example is deuterium, an isotope of hydrogen with an extra neutron, but the same number of protons.
Answer:
the answer is c
Explanation:
melting = become liquefied by heat
solubility = a new bond formation
conductivity = electric transmitter
flammability = burnable
a physical change occurs when materials change shape or size but not the molecular composition of the substance
Gravity is a force because it pulls down on objects.