The atomic mass of an atom can be found by

a. adding the number of protons and number of neutrons in the atom.
b. adding the number of protons and number of electrons in the atom.
c. adding the number of neutrons and number of electrons in the atom.
d. subtracting the number of neutrons from the number of protons in the atom.

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.

i think its 5049.

i hope this !