Period # versus Group #

Front

What is a Period in the periodic table?

Back

A Period is a horizontal row in the periodic table that indicates the number of main energy levels of an atom.

Front

What is a Group in the periodic table?

Back

A Group is a vertical column in the periodic table that indicates elements with similar chemical properties and the same number of valence electrons.

Front

How many valence electrons does an element in Group 15 have?

Back

Elements in Group 15 have 5 valence electrons.

Front

How many main energy levels does an element in Period 3 have?

Back

An element in Period 3 has 3 main energy levels.

Front

What is the significance of valence electrons?

Back

Valence electrons determine an element's chemical properties and its ability to bond with other elements.

Front

How can you determine the Period number of an element?

Back

The Period number corresponds to the highest principal energy level that is occupied by electrons.

Front

What is the relationship between Group number and valence electrons?

Back

The Group number often indicates the number of valence electrons in the outermost shell of the elements.

Front

What are inner electrons?

Back

Inner electrons are the electrons that are not in the outermost shell and do not participate in chemical bonding.

Front

How many inner electrons are typically found in an element from Period 3?

Back

An element from Period 3 typically has 10 inner electrons.

Front

What is the maximum number of electrons in the third main energy level?

Back

The maximum number of electrons in the third main energy level is 18.