There are more than two such atoms.
Perhaps there was a list of atoms you had to chose from.
Anyway, two such atoms are beryllium and magnesium.
That is Beryllium.
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.
Hydrogen and Helium both only need two valence electrons to fill their outer shell.
undiscovered...yet, but there are a few...go forward 50 years and see
protons move to a higher energy level protons move to a lower energy level electrons move to a higher energy level electrons move to a lower energy level
32 electrons maximum
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.
There are more than two such atoms. Perhaps there was a list of atoms you had to chose from. Anyway, two such atoms are beryllium and magnesium.
Helium only needs 2 valence electrons to have a filled outermost energy level.
Hydrogen and Helium both only need two valence electrons to fill their outer shell.
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.
Maximum of 8 electrons in second energy level.
Yes, the outermost energy level of the atoms of the noble gases are filled, meaning that they have the maximum number of electrons. This is why noble gases are stable and unreactive. The atoms of reactive elements share or transfer electrons in order to fill their outermost energy levels, making them stable like the noble gases.
Atoms can fill their outermost energy level by either gaining electrons from other atoms or by sharing the outermost electrons with another atom.
Helium.
undiscovered...yet, but there are a few...go forward 50 years and see
Helium is already full. Helium atoms only need 2 electrons to be full, and Helium, as an element, already has 2.