How does Ocean play an important role in supplying water to us

The water we consume ultimately comes from the sea: because of sunlight, water heats up and evaporates into theatmosphere, where lower temperatures transform steam into droplets, which create clouds. ... More than 97% of the water on earth is in the oceans –the rest is found in glaciers, on lands and in the ground.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

1 a

2 d

3 a

4 c

explanation: