2. An elements has the atomic number of 12. A mass number 24. Find a number of neutrons.
b. number of Elections.
a number of Protons.
serbec

Answer a) 12 neutrons
b) 12 electrons
a) 12 protons

Explanation:

The atomic number is the number of protons in an atom and is also the number of electrons
therefore, the number of protons and electrons = 12

the mass number of an element is = # of protons + # of neutrons
if we rearrange it to find # of neutrons,
# of neutrons = mass number - # of protons
so, 24 - 12 = 12 neutrons

i do not get it   at all

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.