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Helium only needs two electrons to have a filled outermost energy level.
Stable.
filled. That would be 2 electrons for helium, and 8 electrons for the rest of the noble gases in group 18 on the periodic table.
Fluorine needs 8 valence electrons to have a filled outer energy level, following the octet rule. Fluorine naturally has 7 valence electrons, so it only requires one more electron to achieve a stable octet configuration.
Helium atoms only need 2 valence electrons to have a filled outermost energy level because helium is in the first period of the periodic table and its outermost energy level can only hold a maximum of 2 electrons.
Carbon's outermost energy level contains 4 electrons, and it needs 4 more electrons to have this energy level filled (total of 8 electrons).
Bromine has 7 electrons in its outermost energy level.
Helium only needs two electrons to have a filled outermost energy level.
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.
The halogen family elements have 7 valence electrons. This is because they have 7 electrons in their outermost energy level.
Helium and neon will have their outer energy level filled with two electrons. Helium has 2 electrons in its only energy level, while neon has 8 electrons in its second energy level.
Stable.
This atom would be lithium (Li). It has 3 electrons, with 2 electrons in the first energy level and 1 electron in the third energy level.
Completely filled octet.
The neutral atom with the specified electron configuration has 10 electrons in total. This atom is neon (symbol: Ne), which has a total of 10 electrons and has its first two energy levels filled with 2 and 8 electrons, respectively, while the third energy level contains 6 electrons.
The carbon atom's second energy level can hold a maximum of 8 electrons. Carbon has 6 electrons, so the percentage of the second energy level that is filled is 6/8 = 75%.