Bromine has more protons in the nucleus. This results in bromine atoms being heavier than chlorine, and therefore more mass in a certain area (which is more density).
We have to know which of the given statement is not true of carbon.
Not true statement of carbon is - it forms strong ionic bonds.
It can not form ionic bond. to produce ionic bond, carbon has to be converted into either C⁴⁺ or C⁴⁻.
The electronic configuration of C-atom is 1s²2s²2p⁴.
To form C⁴⁺ cation, four electrons must be removed from outermost shell of carbon atom which requires huge energy to supply.
To form C⁴⁻ anion, four electrons must be added to outermost shell of carbon atom which is not possible as outermost shell of C-atom does not have 2d orbital to accommodate extra electrons.
You don't "turn" it into energy; petroleum HAS stored energy (chemical energy).However, you can turn it into ANOTHER TYPE OF ENERGY; usually this is done by burning the petroleum, and using it to drive machinery.
Since burning fuels is wasteful (the efficiency is limited, in theory, to the Carnot efficiency of a heat engine), other options are being explored, such as chemical reactions in a fuel cell. But such technology is not yet used on a large scale.
During physical changes, matter always retains its chemical properties.
