Groups and Periods

Front

What is a halogen?

Back

A halogen is a nonmetal element that forms salts when chemically combined with metals. Examples include Fluorine, Chlorine, Bromine, and Iodine.

Front

What do the period numbers on the periodic table indicate?

Back

The period number indicates the number of energy levels (or shells) that the elements in that period have.

Front

What do elements in the same period have in common?

Back

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

Front

What do elements in the same group have in common?

Back

Elements in the same group have similar chemical properties and the same number of valence electrons.

Front

What are periods on the periodic table?

Back

Periods are the horizontal rows on the periodic table, indicating the number of energy levels of the elements.

Front

What are groups on the periodic table?

Back

Groups are the vertical columns on the periodic table, indicating elements that have similar properties.

Front

Which elements are classified as halogens?

Back

The halogens include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).

Front

How many valence electrons do elements in Group 1 have?

Back

Elements in Group 1 have 1 valence electron.

Front

How many valence electrons do elements in Group 18 have?

Back

Elements in Group 18 (noble gases) have 8 valence electrons, except for Helium, which has 2.

Front

What is the significance of the atomic number?

Back

The atomic number represents the number of protons in an atom's nucleus and determines the element's identity.