Answer:
has Two oxygen atoms
Explanation:
Oxygen is a diatomic element hence exists as O2 for majority of its existence in our atmosphere. Although small portion does exist in form of O3 which protects earth from sun's harmful ray, the majority portion of oxygen has O2 which is the oxygen we breathe.
Well assuming we have all of these, earth
C) Fluorine is the most reactive among halogens
What I think is the charge of nucleus is the proton+neutron
Try out answer C magnesium oxides melting point is almost 5 times higher than magnesium
