A sample of Element "X" is found to contain three isotopes. The first isotope has a mass of 1 amu and a natural abundance of 99%. The second isotope has a mass of 2 amu and an abundance of 0.80%. The third isotope has a mass of 3 amu and an abundance of 0.20%. Calculate the average atomic mass of element "X": a
1.099 amu
b
1.012 amu
c
1.118 amu
d
1.904 amu
e
0.990 amu
f
1.304 amu
g
0.9874 amu
h
1.000 amu

h let me think

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.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.