In its ground state, carbon does not have any electrons in the third energy level.
Carbon has 2 energy levels. There are 6 electrons, 6 protons, and 6 neutrons.
There are 2 energy levels in a Carbon atom. The first energy level consists of '1s' orbital, and the second energy level consists of the '2s' orbital and the '2p' orbital.
The question is more than a little vague. The ground state electronic structure for boron is 1s2 2s2 2p1. In the absence of a magnetic field, this represents three distinct energy levels. The ground state electronic structure for carbon is 1s2 2s2 2p2, which also represents three distinct energy levels in the absense of a magnetic field. If a magnetic field is introduced, it complicates things, because depending on the exact strength of the field it's possible that boron could have electrons in as many as 5 distinct energy levels (and carbon could potentially have six), one for each of the electrons.
The valance energy level contains 4 electrons in carbon.
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.
Two electrons can be housed in the first energy level.
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The first energy level has a maximum of two valence electrons. The second and third energy levels have a maximum of 8 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.
In a neutral carbon atom, there will be 4 electrons in the outer most valence shell.
There are 18 electrons in total, and the outer energy levels are the 4s and 3d orbitals. Therefore, there are 2 electrons in the 4s orbital and 4 electrons in the 3d orbital, making a total of 6 electrons in the outer energy levels.