Periodic Table of Elements

Front

What is the Periodic Table of Elements?

Back

A tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

What does the period number indicate in the Periodic Table?

Back

The period number indicates the number of electron shells (orbitals) that an element has.

Front

How many orbitals does an element in the 3rd period have?

Back

3 orbitals.

Front

How many orbitals does an element in the 4th period have?

Back

4 orbitals.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds.

Front

How many valence electrons does an element in group 16 have?

Back

6 valence electrons.

Front

How many valence electrons does an element in group 13 have?

Back

3 valence electrons.

Front

How many valence electrons does hydrogen have?

Back

1 valence electron.

Front

What is the significance of the group number in the Periodic Table?

Back

The group number indicates the number of valence electrons in the elements of that group.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.