What does the Periodic Table not help scientists do? A. Identify the most common compounds found on Earth.
B. Learn more about elements based on the groups and periods they are in.
C. Make predictions about what kind of properties new elements might have.
D. Determine how many protons, neutrons, and electrons an element has.

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line