Hi There! :)
Active <span>transport requires the use of energy. :)
Therefore A</span>
A calcium atom has 20 protons!
There you go! I really hope this helped, if there’s anything just let me know! ☻
Chlorine (Cl) forms a salt when it is combined with a metal. This element belongs in halogens. GROUP 17
think it maybe 48 mg0 because there should be 2g magnesium in the word equation
