Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by chemical bonds i.e covalent bond in this molecule so option A is correct
hope this helps
Liquids flow because its particles can move over each other. The particles have freedom to move and they will keep moving until it takes the shape of its container.
Solid particles are rigid and tightly packed, they cannot move, so it does not flow.
Answer:- Na = 27.37%, H = 1.20%, C = 14.30% and O = 57.14%
Solution:- For the percentage composition of a compound, the atomic mass of each atoms times its subscript is divided by the molar mass of the compound and multiplied by 100.
The given compound is
.
mass of Na = 22.99 g
mass of H = 1.008 g
mass of C = 12.01 g
mass of O = 3(16) = 48 g
Molar mass of compound = 22.99 g + 1.008 g + 12.01 g + 48 g = 84.008 g
percentage of Na = 
= 27.37%
percentage of H = 
= 1.20%
percentage of C = 
= 14.30%
percentage of O = 
= 57.14%
Using the VSPER theory, the effect of lone pairs on molecular shape can be discussed.
There are 3 types of electron pairs present in a molecular shape: bond pair -bond pair, lone pair - bond pair, lone pair - lone pair.
Strength of repulsions between these three types of pair follows the order:
lone pair- lone pair > lone pair - bond pair > bond pair - bond pair
Whenever there is an addition of lone pairs to the geometry, some distortions take place which decreases the bond angles and some asymmetry is attained in the original molecular shape.