Question

The columns on the Periodic Table are called ____ because they all have similar properties.
The elements in a ___ all have the same number of electron shells.
Group 1 is known as the ____ electron.
Group 2 is known as the ____ electrons. which all have 2 valence
Group 17/7A are known as the ____ electron from other elements. , and like to "grab" an extra
Group 18/8A are the elements. which do not react with other
Valence electrons are the electrons the electron shell on an atom.
which all have 1 valence
or

Answer 1

The columns on the Periodic Table are called groups because they all have similar properties.
The elements in a period all have the same number of electron shells.
Group 1 is known as the alkali metals, which all have 1 valence electron.
Group 2 is known as the alkaline earth metals, which all have 2 valence electrons.
Group 17/7A are known as the halogens, which like to "grab" an extra electron from other elements.
Group 18/8A are the noble gases, which do not react with other elements.
Valence electrons are the electrons in the outermost electron shell on an atom.