Draw an electron dot diagram of i. a non- polar hydrocarbon molecule

ii. a polar covalent molecule

iii. a co-ordinate molecule with three covalent bond​

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.

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answermeridional ;