Question

1. justify why the number of valence electrons stays the same within a group using electron configurations. i need a hint groups or families have similar properties and a play a key role in determining these properties. once an atom has a b, additional electrons are placed in a higher energy level. score: 0/1

Explanation:

Answer:

Valence - electrons are the electrons in the outermost energy level of an atom. Elements in the same group have the same number of valence - electrons because as you move down a group, new electron shells are added, but the number of electrons in the outermost shell (valence electrons) remains the same. Once an atom has a filled inner shell (noble - gas core), additional electrons are placed in a higher energy level. The electron configuration of elements in the same group follows a pattern where the number of electrons in the outermost sub - shells is identical. For example, all elements in Group 1 (alkali metals) have an electron configuration with 1 electron in the outermost s - subshell (ns¹ where n is the principal quantum number representing the energy level).