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Elements P,Q,R and S have atomic …

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Elements P,Q,R and S have atomic numbers. 12, 16, 17 and 10 respectively. Which of them are reactive non-metals? a. P and Q b. P and R c. Q and R

Posted by Harini Rajesh 5 years ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years ago

Answer:

Q and R

Explanation:

We are given that elements P,Q ,R and S have atomic numbers 11,15,17 and 18.

We have to find reactive non metals in given elements.

We know that atomic number of sodium=11

Therefore, P is sodium.

Sodium is metal not non metal

We know that atomic number of phosphorus,P=15

Therefore, Q is phosphorus.

It is no metal because it is required 3 electrons to complete their octet.

Atomic number of chlorine =17

Therefore, element R is chlorine.

It is non metal it required one electron to complete their octet.

Atomic number of argon=18

Therefore, element S is argon.

It is noble gas because it has full filled configuration .It is non reactive because it does not required any electron to complete their octet.

Hence, Q and R are reactive non metals.

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