An atom of magnesium with 12 protons, 12 electrons and 14 neutrons has a mass number of

What is formed when amino acids form long chains or polymerize

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.

Which factor is likely to impact the possible number of compounds? presence of unlimited number of elements in the periodic table the inability of atoms to align perfectly with other atoms the ability of all elements to react with every other element all elements being equally reactive