Which of the following indicates the percentage of the natural occurrence of an isotope of an element on the planet? A. Atomic mass
B. Atomic mass unit
C. Natural abundance
D. Isotope

C. Natural abundance

Explanation:

The percentage of natural occurrence of an isotope of an element on the planet is the natural abundance or the geonormal abundance.

Proportions of each isotope of an element that occurs naturally is the natural abundance. It is represented as a percentage value. From the natural abundance, we can determine the relative atomic mass. If we know the atomic mass of each of the isotope and their abundances, it is easy to determine their relative atomic masses.

Wind will blow from one direction to another.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer