An atom 'X' has atomic number 11 and mass number 23. It has ______ total number of electrons , ________ electrons in its valence shell and will ________ [gain/lose] ________ electrons to become a/an _______ [cation/anion]. It is thus a _____ [ non-metallic/metallic] element
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An atom 'X' has atomic number 11 and mass number 23.
It has total number of 11 electrons, 1 electron in its valence shell and will lose 1 electron to become a cation.
It is thus a metallic element.
The element is sodium.
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