mayafurey622 mayafurey622

23-08-2021
Chemistry

contestada

Based on the models, why do you think helium is number 2( the second element) and beryllium number 4( the fourth element) on the periodic table?

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abrahamnathanael abrahamnathanael

24-08-2021

the atomic number here refers to the number of electron that the atom has. helium only has 2 electrons and beryllium has 4 electron

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