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.
An electron in the outermost energy level of an atom is called a valence electron.(We refer here to the outermost occupied levels of an atom. There are, of course, many other higher energy levels normally available that are not occupied.)These electrons determine the chemical reactivity of the atom.the valence electrons
The highest occupies energy level in aluminum is the 3rd energy level. Its electron configuration is 1s22s22p63s23p1.
The period number tell about the energy levels occupied by electrons
The electron energy levels.
Carbon
hi
An electron in the outermost energy level of an atom is called a valence electron.(We refer here to the outermost occupied levels of an atom. There are, of course, many other higher energy levels normally available that are not occupied.)These electrons determine the chemical reactivity of the atom.the valence electrons
The highest occupies energy level in aluminum is the 3rd energy level. Its electron configuration is 1s22s22p63s23p1.
This is a chemical element. You can find the how many electron in a single atom by using a periodic table.
The element carbon
The period number tell about the energy levels occupied by electrons
The electron energy levels.
Carbon
Electrons are located in energy levels within the electron cloud.
The valence electron shell of noble gases is full.
Only two electron shells.
It has 2 unpaired electrons and 8 empty electron levels.