Answer:The states of matter are the physical forms of matter, which include solid, liquid and gas. The Change of Matter is the change of a substance from one physical state another.
Explanation: Hope it helps guys :)
The person above me is correct
Simple!
Atomic number= number of protons AND number of electrons (in an atom)
Mass number= number of neutrons
Recognizing the Structure of the Periodic Table. Read the periodic table from top left to bottom right. The elements are ordered by their atomic numbers, which increase as you move across and down the periodic table. The atomic number is how many protons the element's atom possesses.