Question

How is the current periodic table of the elements organized?

A. in alphabetical order by element name
B. by atomic number of the atoms that make up each element
C. by average atomic mass of the atoms that make up each element
D. by average number of neutrons in the atoms that make up each element

Answer 1

The correct answer should be C) because each elements atomic mass goes up in the columns as you go from left to right.