U3 Periodic Table 22.23

Front

What are the horizontal rows on the periodic table called?

Back

Periods

Front

How did Mendeleev arrange the elements in the periodic table?

Back

By atomic mass

Front

What is each vertical column on the periodic table called?

Back

Group

Front

What are the elements located on the 'stair-step' line called?

Back

Metalloids

Front

What classification do elements on the right side of the 'stair-step' line belong to?

Back

Nonmetals

Front

What are the two main categories of elements in the periodic table?

Back

Metals and Nonmetals

Front

What is the significance of the atomic number in the periodic table?

Back

It represents the number of protons in an atom's nucleus.

Front

What are alkali metals?

Back

They are highly reactive metals found in Group 1 of the periodic table.

Front

What are noble gases?

Back

They are nonmetals in Group 18 that are mostly unreactive due to their full valence shell.

Front

What is the periodic law?

Back

The properties of elements are a periodic function of their atomic numbers.