Protons
*what is the difference between an atom and an element?
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what four elements make up about 96% of the human body? el a aten
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where can an organized list of all 118 elements be found?
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ably the sune chanical and physical laws, regardless of
whether the 2 are a part of living,

answer:

a particular atom will have the same number of protons and electrons and most atoms have at least ad many neutrons ad protons. an element is a substance that is made entirely from one type of atom. for example, the element hydrogen is made from atoms containing just one proton and one electron.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-