at The atomic neember alement X X, Y, 2 are 8, 12, 17 respectively which of these element belongs same period ?
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electric configuration of X,y,z are as follows
X= 1S² 2s² 2p⁴
Y = 1s² 2s² 2p⁶ 3s²
Z= 1s² 2s² 2p⁶ 3s²3p⁵
here y and z have same shells 3 in the outer configuration. so y and X belong to same period
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