Answer:

first question is A molecule of pure water is made of two hydrogen atoms bonded to an oxygen atom. As explained in a previous Curious Kids article, scientists think the water on Earth may have come from the melting of water-rich minerals during the formation of the planet and icy comets that, billions of years ago, smashed into Earth and melted.

Explanation:

second question is Nonmetals, including (to a limited extent) xenon and radon, usually exist as anions or oxyanions in aqueous solution; they generally form ionic or covalent compounds when combined with metals (unlike metals, which mostly form alloys with other metals); and have acidic oxides whereas the common oxides of nearly all metals are basic.