Periodic Table of the Elements

Front

How many electrons do atoms need to be stable?

Back

Atoms need 8 electrons in their outer shell to be stable, following the octet rule.

Front

In the modern periodic table, elements are arranged by:

Back

Elements are arranged by atomic number, which is the number of protons in the nucleus.

Front

Mendeleev arranged the elements by their ________________

Back

Mendeleev arranged the elements by atomic mass.

Front

Elements in the same period have the same number of

Back

Elements in the same period have the same number of energy levels.

Front

Each vertical column on the periodic table is called a...

Back

Each vertical column on the periodic table is called a group.

Front

What is the atomic number?

Back

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

Front

What is a group in the periodic table?

Back

A group is a vertical column in the periodic table that contains elements with similar chemical properties.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the significance of the periodic law?

Back

The periodic law states that the properties of elements are a periodic function of their atomic numbers.

Front

What is a period in the periodic table?

Back

A period is a horizontal row in the periodic table, indicating the number of energy levels in the atoms.