4Na + O2 --> 2Na20
If 4 moles of Na react completely, how many moles of Na2O form?

What happens to isotopes that are unstable?

May someone me with these science questions

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent