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
21 July, 21:49
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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» 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