How do humans recharge their brains

2. how is heavy water different from normal water

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

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules