Hydrogen has 1 electron in its outer shell, and in fact only 1 electron in total.
ZERO
there are 2 electrons in the inner shell of a hydrogen atom.
No atom can hold 18 electrons in its outer energy shell - there is the valence rule, stating that the maximum for the outer shell is 8 electrons.
Electrons per shell in astatine: 2, 8, 18, 32, 18, 7.
Electrons are not located in the nucleus of an atom.
the number of valence electrons in the atom's outer shell how much the valence electrons are shielded from the nucleus
Not by itself, no (that is, hydrogen is not a noble gas). A neutral hydrogen atom starts out with 1 electron, but it needs 2 electrons to fill its shell. Therefore, a hydrogen atom will often form 1 covalent bond with another atom, in order to gain that 1 extra electron it needs to fill its shell. Important note: Most elements need 8 electrons to get a full shell, but hydrogen is the exception: it only needs 2 electrons to get a full shell.
8 electrons on the outer shell
The outer shell of an atom is the valence shell, which contains the valence electrons.
It is a covalent bond. Each hydrogen atom wants to have a full outer shell of 2 electrons. As each atom has only 1 electron in its shell they can share the electrons between them.
there are 2 electrons in the inner shell of a hydrogen atom.
"valance shell"
Electrons in the outer most shell are called Valence Electrons.
Each hydrogen atom has one electron on its outer shell. The first electronic shell of any element can only hold 2 electrons, this means that each hydrogen atom needs one electron. 2 hydrogen atoms 'share' their electrons with each other, this can be shown on a dot and cross diagram. Each hydrogen now has 2 electrons on their outer shell and they have become stable. ;)
No atom can hold 18 electrons in its outer energy shell - there is the valence rule, stating that the maximum for the outer shell is 8 electrons.
Valence Electrons
An oxygen atom has six (6) electrons in its outer shell.
A chloride anion contains eight outer shell electrons, one more than the seven outer shell electrons found in a chlorine atom.