Home
Class 10
CHEMISTRY
The atomic number of K and Ca is 19 and ...

The atomic number of K and Ca is 19 and 20 respectively and they belong to the same period.
(a) Which amongst them would have smaller atomic size ?
(b) Which one would be more electropositive ?
(c) To which group would each of them belong ?

Text Solution

Verified by Experts

(a) The element Ca is smaller in size since atomic size decreases along a period.
(b) The element K is more electropositive since this character decreases along a period.
(c) The element K is present in group 1 while the element Ca belongs to group 2.
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    DINESH PUBLICATION|Exercise Long Answer Questions|26 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    DINESH PUBLICATION|Exercise HIGHER ORDER THINKING SKILL BASED QUESTIONS|4 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    DINESH PUBLICATION|Exercise Very Short Answer Questions|32 Videos

  • METALS AND NON-METALS

    DINESH PUBLICATION|Exercise MCQ|64 Videos

Similar Questions

Explore conceptually related problems

The atomic numbers of the elements Na, Mg, K and Ca are 11,12,19 and 20 respectively. The element having the largest atomic radius is:

The atomic numbers of three elements A, B and C are 11, 13 and 19 respectively. Explain which two of the elements will belong to the same group of the periodic table.

Five elements A,B,C,D and E have atomic numbers of 2,3,7,10 and 18 respectively. The elements which belong to the same period of the periodic table are:

Out of the elements with atomic numbers given below which one would be a halogen

The atomic numbers of the three elements X,Y and Z are 2,6 and 10 respectively (i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Given reasons for your choice.

DINESH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-Short Ansewer Questions
  1. Arrange the following elements in the descending order of atomic size ...

    Text Solution

    |

  2. The following table shows the positions of six elements A, B, C, D, E ...

    Text Solution

    |

  3. Given below are some elements of the modern periodic table : ""(4)Be...

    Text Solution

    |

  4. The elements Li, Na and K, each having one valence electron, are in pe...

    Text Solution

    |

  5. An element X (atomic number 17) combines with an element. Y (atomic nu...

    Text Solution

    |

  6. Two elements X and Y have atomic number 12 and 17 respectively. (i) ...

    Text Solution

    |

  7. Calcium forms the following salts : Calcium oxide -CaO, Calcium hydr...

    Text Solution

    |

  8. The atomic number of K and Ca is 19 and 20 respectively and they belon...

    Text Solution

    |

  9. Lithium, sodium and potassium are placed in the same group on the basi...

    Text Solution

    |

  10. (a) Name metals among first five elements of the Modern Periodic Table...

    Text Solution

    |

  11. As we move across a period in the periodic table, what is the gradatio...

    Text Solution

    |

  12. How does the tendency of the elements to lose electrons change in the ...

    Text Solution

    |

  13. An element 'X' belongs to 3^(rd) period and group 16 of the Modern, Pe...

    Text Solution

    |

  14. Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respect...

    Text Solution

    |

  15. An element 'X' belongs to 3^(rd) period and group 13 of the Modern Per...

    Text Solution

    |

  16. Compare and contrast the arrangement of elements in Mendeléev’s Period...

    Text Solution

    |

  17. Write the names given to the vertical columns and horizontal rows in t...

    Text Solution

    |

  18. Out of the elements H(1), Be(4), Na (11), Mg(12) : (a) Write the pai...

    Text Solution

    |

  19. The atomic number of an element is 19. (a) Write the electronic conf...

    Text Solution

    |

  20. The electronic configuration of an element 'X' is 2, 8, 6. To which gr...

    Text Solution

    |