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21 July, 20:12

The electron configurations of two unknown elements are x and y. X: 1s2 2s2 2p6 Y: 1s2 2s2 2p6 3s2 3p5 which statement is most likely correct about the two elements

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  1. 21 July, 21:49
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    X: 2,8 = Neon

    Y: 2,8,7 = Chlorine

    Neon has an atomic number of 10. It is referred to as a noble gas and it's a mono atomic element.

    Chlorine has an atomic number of 17. It is referred to as an Halogen. Chlorine exists in nature as a diatomic molecule.

    However the question is incomplete and will need more information.
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