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.)
group 1...is 1 valence. group 2...is 2 valence.
Period 1 of the periodic table has only one electron shell. This shell can hold a maximum of two electrons, which are found in the hydrogen and helium atoms. Therefore, elements in this period have their electrons in the first and only shell, representing the simplest atomic structure.
Atoms with one outer shell electron are located in Group 1 of the Periodic Table, also known as the alkali metals. This group includes elements like lithium, sodium, and potassium. They are characterized by having a single electron in their outermost shell, which makes them highly reactive.
It would depend on the type of atom. Atoms of different elements come in different sizes. We can take an average of about 1 angstrom, that is 10^-10 meters or 10^-8 cm. Using that average you would need 10^8 atoms.
Four atoms with 1 electron in their outermost shells will bond with one atom that has 4 electrons in its outermost shell. This results in the formation of a stable compound with each atom achieving a full outer shell of electrons through sharing or transferring of electrons.
Approximately 1 million atoms can fit across the width of a human hair.
group 1...is 1 valence. group 2...is 2 valence.
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 hydrogen atom (1H) has only 1 proton and 1 electron (you probably think at this electron).
Metals.
Period 1 of the periodic table has only one electron shell. This shell can hold a maximum of two electrons, which are found in the hydrogen and helium atoms. Therefore, elements in this period have their electrons in the first and only shell, representing the simplest atomic structure.
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.
Atoms with one outer shell electron are located in Group 1 of the Periodic Table, also known as the alkali metals. This group includes elements like lithium, sodium, and potassium. They are characterized by having a single electron in their outermost shell, which makes them highly reactive.
How many* and it has 1 electron in it's outer shell, and only has the 1 shell.
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.
Atoms with the same number of valence electrons in the same electron shell are represented by elements in the same group on the periodic table. For example, elements in Group 1 (such as lithium, sodium, potassium) all have 1 valence electron in the outermost shell.