These are called valence electrons.
name the group of elements that have only one electron in their outermost energy level
The electron would be removed from the outermost energy level, which is the fourth energy level, for calcium.
The chloride ion (Cl-) has 8 electrons on the outermost energy level.
Fluorine has 7 electrons in its outermost energy level. Its electron configuration is 2-7, with 7 electrons in the outermost energy level, making it highly reactive.
An electron in the outermost energy level of an atom is called a valence electron.(We refer here to the outermost occupied levels of an atom. There are, of course, many other higher energy levels normally available that are not occupied.)These electrons determine the chemical reactivity of the atom.the valence electrons
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.
The element with its outermost electron in the 7s1 orbital is francium (element 87). Its outermost electron is in the 7th energy level (n=7), specifically in the 7s subshell.
Sodium has one electron in its outermost principal energy level, also known as the valence shell.
The valence electrons are the outermost electrons, i.e. those that reside in the outermost energy level.
The outermost electrons are called VALENCE electrons.
This is an electron situated on the outermost level.
The question is somewhat vague. If the question were written as an atom contains seven electrons in the outermost energy level and that outermost shell is a p-shell then the atom is a halogen. If the atom contains seven electrons in the outermost energy level and that outermost shell is a d-shell or f-shell then the atom is a metal.