Answers

2016-03-13T14:22:48+05:30

z will be more reactive .

as x has 18 as atomic number, it's electronic configuration will be (2,8,8)

hence, it becomes a noble gas .

noble gases are very inert and unreactive in nature .

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2016-03-15T18:31:15+05:30
Element having Z will be more reactive. As element has X has atomic no. 18 ...its configuration is 2,8,8 It become a noble gas. And we knw tht nobles gases are unreactive and stable in nature. Therefore element Z is more reactive than element X.
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