SELECT * FROM question_mgmt as q WHERE id=1270 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=43 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Which of the following are isoelectronic species i.e., those having the same number of electrons?

Na+, K+, Mg2+, Ca2+, S2–, Ar

Answer:

Isoelectronic species = they are the species belonging to different atoms or ions which have same number of electrons but different magnitude of nuclear charge.

Now, A positive charge denotes the loss of an electron & A negative charge denotes the gain of an electron by a species.

 

1) Number of electrons in sodium (Na) = 11

Therefore, Number of electrons in (Na+) = 10

2) Number of electrons in K+ = 18

3) Number of electrons in Mg2+ = 10

4) Number of electrons in Ca2+ = 18

5) Number of electrons in sulphur (S) = 16

∴ Number of electrons in S2- = 18

6) Number of electrons in argon (Ar) = 18

 

Hence, the following are isoelectronic species:

1) Na+ and Mg2+ (10 electrons each)

2) K+, Ca2+, S2– and Ar (18 electrons each)


< Previous Question

Next Question >

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='9' AND ex_no!=0 AND status=1 and id!=1270 ORDER BY views desc, last_viewed_on desc limit 0,10

  • Popular questions of class 11 Chemistry

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='2' AND subId='9' AND ex_no!=0 AND status=1 and id!=1270 ORDER BY last_viewed_on desc limit 0,10

  • Recently Viewed Questions of Class 11 Chemistry

Comments

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

Comment(s) on this Question


Important links

Quick Links

Resources

Support