Periodic Table Answers

What are 1A, 3B, and 7A examples of on the periodic table?

While developing his periodic table, Dmitri Mendeleev broke his own rule and placed the element tellurium before iodine in the group. He did this even though tellurium's atomic mass was known to be greater than iodine's. In his notes, Mendeleev stated that he expected tellurium to have a lower atomic mass than iodine. However, all measurements continue to show that tellurium has a greater atomic mass than iodine even though tellurium acts like it has a lower atomic mass.

Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?

While looking at calcium (Ca) on the periodic table, a student needs to find an element with a greater atomic mass in the same period. Where should the student look?

The element phosphorus is located to the right of the element magnesium along the same period in the periodic table.Which best describes the relationship of the elements?

In an element’s square on the periodic table, the number with the greatest numerical value represents the

Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made.

Based on the information in the table, which two elements are most likely in the same group, and why?

This is how osmium appears in the periodic table.

How many groups are in the modern periodic table?