This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
Sodium has ONE valence electron in its outer shell that is to be donated to any kind of oxidant. By then the outer (3rd) shell (of the Na+ ion) is EMPTY, so the 2nd shell has become the outmost, containing 8 electrons (Ne-configuration). No electrons at all are taken up by sodium.
Four.
1st shell: 2 electrons, 2nd shell: 8 electrons, 3rd shell: 8 electrons, 4th shell: 4 electrons, 5th shell: 0 electrons, 6th shell: 0 electrons.
All halogens (group 17) have 7 valence electrons.Electronic Configuration of Br = 1s22s22p63s23p64s24p5Number of e- in valence shell (outmost s and p-orbital) = 2 + 5 = 7e-
It has 5 electrons in its outermost shell.
there are two electrons the first shell hold
Sulphur has 6 electrons in its outermost shell.
There are two electrons in the valance shell of helium. Since this is the first shell, it is filled by two electrons.
2 electrons in the K shell and 8 electrons in the L shell
In the first shell there are two electrons and in the second shell there are six electrons, but only the electrons in the second (outer) shell are valence electrons.
Boron has three electrons in its outer shell
Vanadium has on the outer shell two electrons.