Periodic Table and Atoms Review

Front

What are ions?

Back

Ions are atoms with a positive or negative charge.

Front

Who discovered the electron using a cathode ray tube?

Back

Joseph Thomson.

Front

Which group is the most reactive nonmetal group?

Back

Group 17.

Front

How many electrons and neutrons does a neutral atom of Carbon-13 have?

Back

6 electrons and 7 neutrons.

Front

What do elements in the same group have in common?

Back

They have the same number of valence electrons.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the significance of valence electrons?

Back

Valence electrons determine how an element reacts chemically.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number.

Front

What are noble gases?

Back

Noble gases are elements in group 18 that are mostly inert and do not readily react with other elements.