Science
The electronic configuration of three elements X, Y and Z are X - 2, 8, 7; Y - 2, 8, 2; and Z - 2, 8
options
- Y and Z are metals
- Y and X are non-metals
- X is a non-metal and Y is a metal
- Y is a non-metal and Z is a metal
Metals & Non-Metals
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Answer
X is a non-metal and Y is a metal
Reason —
- X : 2, 8, 7 → 7 valence electrons (like chlorine) so it tends to gain 1 electron to complete the octet, a typical non-metal behaviour.
- Y : 2, 8, 2 → 2 valence electrons (like magnesium) so it readily loses 2 electrons to form Y2+, which is characteristic of metals.
- Z : 2, 8 → complete octet (neon) so it is an inert noble gas.
Thus, X is a non-metal and Y is a metal.
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