You shouldn't use terms like "outer level", because they're confusing. It could potentially mean at least two things, specified more precisely below.
The highest occupied energy level of a ground state neutral carbon atom, the 2p level, has two electrons.
The number of electrons in a ground state neutral carbon atom that have a principal quantum number of 2 (the highest associated with any electrons in such an atom) is four.
The energy level of an atom is occupied by electrons, which are negatively charged particles that orbit around the nucleus. The energy of these electrons depends on their distance from the nucleus and the specific quantum energy levels they occupy.
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 period tells you how many energy levels an atom has.
The energy levels of an atom hold electrons.
The energy of an electron in the second shell of a carbon atom is higher than in the first shell because electrons in shells that are further from the nucleus have higher energy levels. This is due to the increased distance from the positively charged nucleus in the atom, which decreases the electrostatic attraction between the nucleus and the electron.
electrons
the period number tells which is the highest energy level occupied by the electrons
An atom's energy levels are occupied by electrons. Electrons occupy the energy levels, or electron shells, in order of increasing energy. The lowest energy level is filled first before electrons move to higher energy levels.
An atom's energy levels are orbitals which can contain 2 electrons each, assuming that they are traveling in opposite directions from each other.
the period number tells which is the highest energy level occupied by the electrons
The energy level of an atom is occupied by electrons, which are negatively charged particles that orbit around the nucleus. The energy of these electrons depends on their distance from the nucleus and the specific quantum energy levels they occupy.
In a neutral atom of calcium, there are 4 energy levels that are partially or fully occupied. Calcium has 20 electrons, distributed among the 4 energy levels with 2, 8, 8, and 2 electrons in each energy level, respectively.
Neon has the 1s2, 2s2, and 2p6 levels filled.
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.
An atom of oxygen has 2 energy levels that are occupied - the first energy level (K shell) can hold up to 2 electrons, and the second energy level (L shell) can hold up to 6 electrons. Oxygen has a total of 8 electrons.
The period number tell about the energy levels occupied by electrons
Carbon has 2 energy levels. There are 6 electrons, 6 protons, and 6 neutrons.