The question is vague, as shell can mean valence shell or inner shells that can also fit atoms via 'sharing' for transition metals, however, the number of atoms that can fit would determine on the number of electrons and vacant spots available for sharing on the outermost electronic shell. (Assume the question in mind is for covalent bonding; does not apply to ionic bonding.)
they loose electrons from its outershell
How many atoms / electron clouds does helium have ?
1-butene has four carbon atoms.
The answer is Valence Electrons. Atoms want a full number of electrons in their outer shell, which is why atoms with only one electron missing from their outer shell are most reactive, because they are close to completing that shell. Electrons as such are half-spin particles or fermions. A single particle electron orbital (intended as a solution of a 1-D Schrödinger equation) with occupancies 0 and 1 can have 2 allowed quantum states. Electrons are seen as indistinguishable particles in quantum mechanics. In other words electron 1 is the same as electron 2. We can then state that any electron of appropriate energy will be able to occupy the outermost shell of an element.
5 atoms, 1 compound.
The hydrogen atom (1H) has only 1 proton and 1 electron (you probably think at this electron).
Metals.
There can be 10 electrons in the n=2 shell. Two can fit in the 1s orbital, two can fit in the 2s orbital, and six can fit in the 2p orbital.
The atoms it is made out of do not have 1 or 2 valence electron on the outer shell, so therefore they do not conduct electricity well. Atoms that do have 1 or 2 valence electron on the outer shell, like copper, conduct electricity well.
they loose electrons from its outershell
Use the figure 2n2 where n = the shell number. There are many levels of shells, so "inner" is not a very specific term. If you mean "inner-most" shell however, then the answer would be two, since n = 1.
A lone chlorine atom has 7 outer shell electrons, 1 electron short of a full outer shell of 8 electrons, which is stable. In order to achieve this full outer shell two chlorine atoms share a pair of electrons, with each atom contributing 1 electron to the pair. By sharing electrons in this manner the chlorine atoms achieve a full outer shell.
Atoms in column 7 of the Periodic Table have 7 electrons in their outer shell. Atoms are most stable when they have 8 electrons in their outer shell. So atoms of elements in column 7 have a strong attraction for 1 electron. Flourine being the smallest atom in that column has the strongest attraction for 1 electron.
The overall of an atom is a nucleus (protons and neutrons), and 1 or 2 electrons. The rest are for large atoms: an electron shell, electrons, an electron shell, electrons, an electron shell, electrons, an electron shell, electrons, an electron shell, electrons, an electron shell, electrons, an electron shell, electrons.
Atoms in column 7 of the periodic table have 7 electrons in their outer shell. Atoms are most stable when they have 8 electrons in their outer shell. So atoms of elements in column 7 have a strong attraction for 1 electron. Flourine being the smallest atom in that column has the strongest attraction for 1 electron.
Oxygen is a non-metal in the 6A Group, so it needs 2 electrons to reach 8 in its outer shell. Sodium is a metal in the 1A Group, so it has 1 electron in its outer shell to donate. Since the oxygen needs 2, but a sodium can only donate 1, the oxygen will get an electron from two sodium atoms, giving the formula:Na2O
Hydrogen has the smallest atoms of any element, as it has only 1 electron in 1 electron shell and 1 proton. This is why it's first on the Periodic Table.