which of the following will contain convalent double between its atom a) hydrogen b) oxygen c) nacl d) cl2 pkz ans it i will give more points+ if ur ans correct mark as brainlist and give 5 votes.

oxygen

Explanation:

because all other needs one electron but for double bond must be deficiency of atleast 2 electron

Oxygen because the valency of oxygen is 2.

It belongs to the group 6 A so it has total valence electron 6, so in order to complete its valence shell it needs 2 electron.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

the maximum mass of nh3 is nh3 in grams