Home
Class 10
CHEMISTRY
The atomic number of an element is 20. I...

The atomic number of an element is `20`. In modern periodic table, this element is placed in

A

2nd period

B

4th period

C

3rd period

D

1st period

Text Solution

Verified by Experts

The correct Answer is:
B
NA
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    LAKHMIR SINGH & MANJIT KAUR|Exercise SHORT ANSWER TYPE|8 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    LAKHMIR SINGH & MANJIT KAUR|Exercise LONG ANSWER TYPE|3 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    LAKHMIR SINGH & MANJIT KAUR|Exercise VERY SHORT ANSWER TYPE|6 Videos

  • METALS AND NON-METALS

    LAKHMIR SINGH & MANJIT KAUR|Exercise Short Answer Type Qustions|1 Videos

  • TEST PAPER 1

    LAKHMIR SINGH & MANJIT KAUR|Exercise Section B|4 Videos

Similar Questions

Explore conceptually related problems

The electronic configuration of the atom of an element X is 2,8,4. In modern periodic table, the element X is placed in

The electronic configuration of an element M is 2,8,4. In modern periodic table, the element M is placed in

In the modern periodic table, elements are arranged in

In the modern periodic table, the elements are arranged in the order of :

Name two elements of first period in modern periodic table.

If the atomic number of an element is 33, it will be placed in the periodic table in the

If the atomic number of an elements is 13, it will be placed in the periodic table in

If the atomic number of an elements is 33, it will be place in the periodic tabe in the

LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Which of the following statements is not a correct statement about the...

    Text Solution

    |

  2. The electronic configuration of the atom of an element X is 2,8,4. In ...

    Text Solution

    |

  3. The atomic number of an element is 20. In modern periodic table, this ...

    Text Solution

    |

  4. Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and ...

    Text Solution

    |

  5. The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 ...

    Text Solution

    |

  6. Which of the following elements would lose an electron easily ?

    Text Solution

    |

  7. Which of the following elements does not lose an electron easily ?

    Text Solution

    |

  8. Where would you locate the element with electronic configuration 2,8 i...

    Text Solution

    |

  9. An element which is an essential constituent of all organic compounds ...

    Text Solution

    |

  10. Which of the following is the valence shell for the elements of second...

    Text Solution

    |

  11. The element which has the maximum number of valence electrons is:

    Text Solution

    |

  12. The correct increasing order of the atomic radii of the elements oxyge...

    Text Solution

    |

  13. The atomic numbers of the elements Na, Mg, K and Ca are 11,12,19 and 2...

    Text Solution

    |

  14. Which of the following are the correct characteristics of isotopes of ...

    Text Solution

    |

  15. The correct formula of the oxide of Eka-aluminium element predicted by...

    Text Solution

    |

  16. The element which can form an acidic oxide should be the one whose ato...

    Text Solution

    |

  17. The element which forms a basic oxide has the atomic number of:

    Text Solution

    |

  18. Which one of the following does not increase while moving down the gro...

    Text Solution

    |

  19. On moving from left to right in a period in the periodic table, the si...

    Text Solution

    |

  20. Which of the following set of elements is written in order of their in...

    Text Solution

    |