Question

match the atomic no. 2,4,8 ,15and19 with each of following a solid non metal belonging to the third period​

Answer 1

Answer:

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Answer 2

Answer:

A solid non metal belonging to the third period with atomic number of 15 is phosphorus with symbol P.

A metal of valency 1 is potassium with symbol K. Its atomic number is 19 and is an alkali metal.

A gaseous element with valency 2 is helium. Its symbol is He and atomic number is 2. It is an inert gas.

An element belonging to Group 2 (alkaline earth metals) is beryllium (Be). It has atomic number of

A rare gas (or inert gas) is helium. Its symbol is He and atomic number is 2. Its valency is 2.

Explanation:

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