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They are both in the periodic table (both are elements) and both are a matter.
They all have 0NE electron in their outer shell: called s-electron. That's why they belong to group 1
An element with an incomplete d subshell. Elements which have common cations with incomplete d subshells are also considered transition metals. Elements with incomplete f subshells are sometimes called "inner transition elements."
Group 17, or the Halogen Group, all have 7 valence electrons and will gain or share an electron when forming compounds with other elements. They are all non-metals except for astatine, which is a metalloid. They are the most reactive non-metals because they only need one more electron to fill the outer shell.
They all have one electron in the outer most shell
They have the same number of valence electrons, or electrons in the outer electron shell. This allows them to react with certain elements.
Rows of elements are called periods. The period number of an element signifies the highest unexcited energy level for an electron in that element. Columns of elements help define element groups. Elements within a group share several common properties. Groups are elements have the same outer electron arrangement.
Electron configuration - they have the same number of elements in their outer 'electron shell'. This induces them to have similar bonding properties, and so elements in the same group are chemically similar.
their internal structure makes them behave in a similar way.
They all lose an electron each and so carry a charge of +1.
They are all reactive metals with one valence electron in their outermost s sublevel.
From a physics standpoint, F = ma Fg = mg From a common sense standpoint, personal experience
They all have one valence electron in their outer shells and so tend to lose that electron in chemical reactions, gaining a +1 charge.
The proton and electron number are equal for all isotopes of the same specific element.
All of the elements in column 18 of the periodic table are noble gases. This means their outer electron shells are completely full and in most cases are inert.
They each have one valence electron in the outermost shell (or "orbital"). All the elements in Group 1 have this trait.