Which types of changes must follow the law of conservation of mass? (2 points) O Both physical and chemical changes
O Neither physical nor chemical changes
O Only physical changes
O Only chemical change

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

let that person have a turn to speak : )

just did the assignment and the answer was #1 +2 n