Question

How many valence electrons do elements in the following groups have. Group 8A. Group 3A. Group 1A.

Answer 1

Elements in Group 8A (noble gases) have eight valence electrons, Group 3A (boron group) have three valence electrons, and Group 1A (alkali metals) have one valence electron.

Step-by-step explanation:

The number of valence electrons is vital for determining an element's chemical properties and its behavior in reactions. According to the periodic trend of valence electrons, the group number helps us determine the number of valence electrons for elements within that group:

• Group 8A (or Group 18 using the current IUPAC designation) includes the noble gases, which have eight valence electrons. These electrons are distributed in an octet, which is associated with chemical stability.
• Group 3A (or Group 13) is known as the boron group. Elements in this group typically have three valence electrons.
• Group 1A (or Group 1) includes the alkali metals, which have one valence electron.

Thus, elements in Group 8A have eight valence electrons, elements in Group 3A have three valence electrons, and elements in Group 1A have one valence electron.