Atoms and the Periodic Table Test Review

Front

What is the most reactive metal group on the periodic table?

Back

Group 1

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number

Front

What is the number at the top of an element's box on the periodic table called?

Back

Atomic number

Front

What does the number at the bottom of an element's box represent?

Back

The average number of protons and neutrons in the nucleus

Front

What does the arrow going across the periodic table represent?

Back

A period

Front

What is the definition of an atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is the definition of a mass number?

Back

The total number of protons and neutrons in an atom's nucleus.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that determine its chemical properties.

Front

What is the significance of Group 17 on the periodic table?

Back

Group 17 contains the halogens, which are highly reactive nonmetals.

Front

What is the significance of Group 18 on the periodic table?

Back

Group 18 contains the noble gases, which are inert and do not readily react with other elements.