If the outermost shell of an atom has four to seven electrons, it is generally a ……………

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Solution

Non-metal — the tendency of the substance to gain electrons & form anion is considered non-metal
Most of the non-metals have 4 to 7 electrons in their valence shells
they have generally lacked a predominance of metallic properties
the electrons in non-metals behave differently from those in metals
Thus, If the outermost shell of an atom has four to seven electrons, it is generally a Non-metal

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