Surface tension explains which of the following
phenomena?
i) a bowling ball sinking more slowly
through molasses than through water
ii) separating ethanol from water by distillation
iii) water beading on a windshield during
the rain
1. i and iii
2. i, ii and iii
3. iii only
4. ii and iii
5. i only
6. ii only

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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.