the elements of a period of the periodic table are given below in order from left to right with one of its element missing: na mg al si s cl ar to which period do these elements belong?
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phosphorus is missing and these elements belongs to period.
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Answer:
phosphorus : atomic no. 15 is missing
Explanation:
Na-atomic no. 11
E. C. = 2,8,1
Mg - atomic no. 12
E. C. =2,8,2
since theses elements have three shells.
so all these elements belong to 3rd period
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