Periodic Table

The periodic table has ____ periods (rows) and ____ groups (columns).

• 18, 7

• 7, 18

• 8, 4

• 4, 8

Which scientist created the first periodic table?

• Dmitri Mendeleev

• Isaac Newton

• Albert Einstein

• John Dalton

Metals are found on the ____ side of a periodic table and nonmetals are found on the ___ side.

• left, right

• right, left

Atomic number tells you _________.

• the number of protons in an atom

• the number of electrons in an atom

• the number of neutrons in an atom

• the atomic mass of an atom

Which element has an atomic number of 12?

• Magnesium

• Carbon

• Sodium

• Scandium

Which element has an atomic mass of 10.81?

• Boron

• Carbon

• Neon

• Sodium

You can find the _____ an atom has by subtracting "atomic mass - number of protons".

• number of neutrons

• number of electrons

• atomic mass

• atomic number

The first energy shell can hold up to __ electrons. The second energy shell can hold up to __ electrons. The third energy shell can hold up to __ electrons.

• 2, 8, 18

• 2, 8, 16

• 2, 4, 8

• 2, 6, 14

Why do atoms create bonds with other atoms?

• to get a full outer shell

• to make colorful compounds

• to find atoms with the same number of electrons

• because they are lonely

When two or more different types of atoms bond, they create a _____ such as NaCl.

• compound

• concoction

• potion

• mixture