1. one of the essential minerals in the human body is salt. how much salt is in the average adult human body?

a. 1 kilogram
b. 500 grams
c. 250 grams
d. practically none

Yes I agree, the answer is C) 250 grams since the average human body contains around 200 grams.

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.