What determines an atom's reactivity? a)how many protons the atom contains. b)how many energy levels the atom contains. c)whether the atom is a metal or a nonmetal. d)how many valence electrons the atom contains. plz

Even before world war ii had ended, it was apparent that the allies would not remain friends in the post-war era. describe how the conflict between the superpowers manifested itself in the two following region: asia

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Which steps are important when designing and conducting a scientific experiment? hide the results from fellow scientists. identify the independent variable. eliminate all dependent variables. address any confounding variables. form a non-falsifiable hypothesis.