A covalent bond is likely to be polar when . one of the atoms sharing electrons is more electronegative than the other atom carbon is one of the two atoms sharing electrons the two atoms sharing electrons are equally electronegative the two atoms sharing electrons are of the same elements 0

one of the atoms sharing electrons is more electronegative than the other atom

Explanation:

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.