Home
Class 12
CHEMISTRY
Which of the following statement is not ...

Which of the following statement is not correct

A

Tc and Pm are not found in nature

B

Element having `ns^(2) np^(5)` configuration are placed in the column before the extreme righ in the P.T.

C

Most of the man made element occurs in the actinide series.

D

In 3rd period no. of electrons=18

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • p-Block Element

    ALLEN|Exercise All Questions|20 Videos

  • RACE

    ALLEN|Exercise more than may be correct|2 Videos
ALLEN-Periodic Table -All Questions
  1. The elements which are radioactive and have been named after the name ...

    Text Solution

    |

  2. Which of the following statement is not correct

    Text Solution

    |

  3. Which of the following statement is not correct

    Text Solution

    |

  4. Which of the following is not correctly matched

    Text Solution

    |

  5. An element whose IUPAC name is ununtrium (UUT) belong to

    Text Solution

    |

  6. If Z(eff) of sodium is 'x' then Z(eff) of calcium is :-

    Text Solution

    |

  7. Lanthanoid contraction will not have any influence when we compare siz...

    Text Solution

    |

  8. In which one of the following pairs is the radius of the second specie...

    Text Solution

    |

  9. Which of the following species will have the largest and the smallest ...

    Text Solution

    |

  10. In which pair the first atom or ion is not larger than the second :-

    Text Solution

    |

  11. Which one of the following statements is incorrect ?

    Text Solution

    |

  12. Which of the following properties among halogens decreases from fluori...

    Text Solution

    |

  13. The correct values of ionization enthalpies(in KJ "mol"^(-1)) of Si, P...

    Text Solution

    |

  14. From the ground state, electronic configuration of the elements given ...

    Text Solution

    |

  15. An element has successive ionization enthalpies as 940 (first),2080,30...

    Text Solution

    |

  16. The incorrect statement among the following is :-

    Text Solution

    |

  17. Ionisation energy depends upon:

    Text Solution

    |

  18. The first ionisation enthalpy (Delta(i)H^(o-)) values of the third per...

    Text Solution

    |

  19. Which one of the following statements is incorrect in relation to ioni...

    Text Solution

    |

  20. The IP(1),IP(2),IP(3),IP(4) and IP(5) of an element are 7.1, 14.3, 34....

    Text Solution

    |