Home
Class 12
CHEMISTRY
The mass number of two atoms X and Y is ...

The mass number of two atoms X and Y is the same (40 each) but their atomic numbers are different (being 20 and 18 respectively). X and Y are examples of :

A

chemically similar atoms

B

isotopes

C

solid and liquid metals

D

isobars

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • SURFACE CHEMISTRY

    MODERN PUBLICATION|Exercise EXERCISE|411 Videos

  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise EXERCISE|102 Videos

Similar Questions

Explore conceptually related problems

The number of electrons in an ion Y2- is 10. What is the atomic number of an element Y.

The number of atoms in 20g of SO3 is approximately

Name the atoms having same atomic number but different mass numbers

What is the significance of number of protons found in the atoms in each of the different elements ?

The atom of an element X has 7 electrons in its M shell. What is the atomic number of element X ?

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

Suppose two elements X and Y combine to form two compound XY_2 and X_2Y_3 weigh 85g . The atomic masses of X and Y are respectively :

Explain with examples : Atomic number

MODERN PUBLICATION-SURFACE CHEMISTRY-EXERCISE
  1. What is the number of valence electrons in the atoms of an element hav...

    Text Solution

    |

  2. Give the number of protons, neutrons and electrons in the chlorine ha...

    Text Solution

    |

  3. The mass number of two atoms X and Y is the same (40 each) but their a...

    Text Solution

    |

  4. Elements having valency ‘one’ are :

    Text Solution

    |

  5. For an element, Z = 9. The valency of this element will be :

    Text Solution

    |

  6. The number of valence electrons in a sulphide ion, S2–, is :

    Text Solution

    |

  7. The atomic number of an element X is 8 and that of element Y is 4. Bot...

    Text Solution

    |

  8. What is the number of valence electrons in : (a) sodium ion, Na+

    Text Solution

    |

  9. In physisorption adsorbent does not show specificity for any particula...

    Text Solution

    |

  10. Which of the following is an example of absorption ?

    Text Solution

    |

  11. On the basis of data given below predict which of the following gases ...

    Text Solution

    |

  12. In which of the following reactions heterogenous catalyse is involved?...

    Text Solution

    |

  13. What is the number of valence electrons in : (b) oxide ion, O2–

    Text Solution

    |

  14. Atom A has a mass number 209 and atomic number 82. Atom B has a mass n...

    Text Solution

    |

  15. Method by which lyophobic sol can be protected.

    Text Solution

    |

  16. Freshly prepared precipitate sometimes gets converts colloidal solutio...

    Text Solution

    |

  17. Which of the following electrolytes will have maximum coagulating valu...

    Text Solution

    |

  18. A colloidal system having a solid substances as a dispersed phase and ...

    Text Solution

    |

  19. The values of colligative properties of colloidal solution are of smal...

    Text Solution

    |

  20. Atom A has a mass number 209 and atomic number 82. Atom B has a mass n...

    Text Solution

    |