Which is a factor in determining the average atomic mass of an element?
a. atomic number of the most abundant isotope
b. relative abundance of each isotope
c. sum of atomic masses of all isotopes
d. product of atomic masses of all isotopes
e. arithmetic mean of atomic masses of the isotopes

B. Relative abundance of each isotope

Explanation:

Average atomic mass is the average mass of all the isotopes present depending on the relative abundance of each isotope.

Example:

Mass of isotope 1 = 203.973 amu

relative abundance of isotope 1 = 0.014

Mass of isotope 2 = 205.9745 amu

relative abundance of isotope 2= 0.241

Mass of isotope 3 = 206.9745 amu

relative abundance of isotope 3 = 0.221

Mass of isotope 4 = 207.9766 amu

relative abundance of isotope 4 = 0.574

Formula used for average atomic mass of an element :

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.