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
are responsible for the chemical properties of an atom.
The columns on the Periodic Table are called "groups" because they all have similar properties.
The elements in a group all have the same number of electron shells.
Group 1 is known as the "alkali metals." These elements all have 1 valence electron.
Group 2 is known as the "alkaline earth metals." These elements all have 2 valence electrons.
Group 17/7A are known as the "halogens." These elements are highly reactive and like to "grab" an extra electron from other elements.
Group 18/8A are the "noble gases" which do not react with other elements due to having a full outer electron shell.
Valence electrons are the electrons found in the outermost electron shell on an atom.
- In Group 1, all elements have 1 valence electron.
- In Group 17/7A, all elements have 7 valence electrons.
- In Group 18/8A, all elements have 8 valence electrons.
Valence electrons are the electrons present in the outermost shell, or energy level, of an atom. They are the electrons that are involved in chemical reactions and interact with other atoms to form bonds. The number of valence electrons determines an element's chemical properties and its ability to form compounds with other elements.
To determine the number of valence electrons for an element, you can refer to the periodic table. In general, elements in Group 1 (also known as Group 1A) have 1 valence electron, elements in Group 2 (Group 2A) have 2 valence electrons, elements in Group 17 (Group 7A) have 7 valence electrons, and elements in Group 18 (Group 8A) have 8 valence electrons. These group numbers correspond to the number of valence electrons present in the elements of those groups.
It is important to note that there are some exceptions to the general trend of valence electrons in the periodic table. For example, transition metals in the d-block may have varying numbers of valence electrons, and elements in the p-block (Groups 13-18 or 3-8A) can also have different numbers of valence electrons based on their position in the periodic table.
To summarize, valence electrons are the electrons in the outermost shell of an atom, and their number determines the element's chemical reactivity and ability to form compounds with other elements. The number of valence electrons can be determined by referring to the periodic table and identifying the group number of the element.