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Helium only needs 2 valence electrons to have a filled outermost energy level.
Stable.
it has 2 because the first energy level has 1
There are no noble gases in the first energy level. Noble gases are found in the last (highest) energy level of an atom. The first energy level can only hold a maximum of 2 electrons, while the noble gases have completely filled outermost energy levels.
0 It already is full
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.
Helium only needs 2 valence electrons to have a filled outermost energy level.
7, since bromine is a halogen
8 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.
What is the neutral atom that has its first two energy levels filled, has 5 electrons in its third energy level, and has no other electrons? Enter the name of the element, not the abbreviation.
Stable.
Sodium
Completely filled octet.
Outer energy level electrons, or valence electron.
it is called complete or completely stable
Completely filled octet.