Period # versus Group #

Front

What are valence electrons?

Back

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

Front

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

Back

Elements in Group 15 have 5 valence electrons.

Front

What is the significance of the Period number in the periodic table?

Back

The Period number indicates the number of main energy levels (shells) that an atom has.

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 are inner electrons?

Back

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

Front

How many inner electrons does an element with 15 total electrons have if it has 5 valence electrons?

Back

It has 10 inner electrons.

Front

What is the relationship between Group number and valence electrons?

Back

The Group number often indicates the number of valence electrons for main group elements.

Front

What is the maximum number of electrons that can occupy a main energy level?

Back

The maximum number of electrons in a main energy level is given by the formula 2n², where n is the energy level.

Front

How many electrons can the third main energy level hold?

Back

The third main energy level can hold a maximum of 18 electrons.

Front

What is the electron configuration for an element in Group 15, Period 3?

Back

The electron configuration is 1s² 2s² 2p⁶ 3s² 3p³.