Home
Class 10
CHEMISTRY
From the following elements : (4)Be,(9...

From the following elements :
`_(4)Be,_(9)F,_(19)K,_(20)Ca`
(i) Select the element having one electron in the outermost shell.
(ii) Two elements of the same group.
Write the formula and mention the nature of the compound formed by the union of `_(19)K` and element X (2,8,7).

Text Solution

Verified by Experts

(i) The elements which have one electron in the outermost shell are
`_(19)K=2,8,8,1`
(ii) Two elements of the same group are Beryllium (Be) and Calcium (Ca).
`_(4)Be=2,2`
`_(20)Ca=2,8,8,2`
Formula of element K and element X:
Both elements K and X have valency one.
So,
It is an electrovalent compound.
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC:2- LONG ANSWER TYPE QUESTIONS|5 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise NCERT CORNER -INTEXT QUESTIONS|13 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC:2-SHORT ANSWER TYPE QUESTIONS-I|25 Videos

  • METALS AND NON-METALS

    OSWAAL PUBLICATION|Exercise NCERT CORNER (Textbook Exercises)|16 Videos

  • SOLVED PAPER SSLC KARNATAKA APRIL 2019

    OSWAAL PUBLICATION|Exercise QUESTIONS|49 Videos

Similar Questions

Explore conceptually related problems

Given below are some elements of the Modern Periodic Table: ""_(4)Be, ""_(26)Fe.""_(14)Si, ""_(19)K ""_(20)Ca i) Select the element that has one electron in the outermost shell and write its electronic configuration. ii) Select two elements that belong to the same group. Give reason. iii) Select two elements that belong to the same period. Which one of the two has a bigger atomic size?

An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound. (i) Write the position of these elements in the modern periodic table. (ii) Write the formula of the compound formed. Justify your answer in each case.

The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.

Some of the elements and their atomic numbers are mentioned in the following table : (i) How many valence electrons are there in the element 'R' ? (ii) What is the valency of 'P' ? (ii) Write the chemical formula of the compound formed by combining the elements ‘P' and 'Q'? (iv) Out of the two elements 'P' and 'S', which one is larger in size ?

An element has same number of electrons in I and IV shells and in the II and III shells i] Write its electronic configuration ii] Write the group and period it belong iii] What is the valency of the element

The electrons in the atoms of four elements A, B, C, and D are distributed in three shells having 1,3,5, and 7 electrons in their outermost shell respectively. State one period in which these elements can be placed in the Modern Periodic Table. Write the electronic configuration of the atoms A and D and molecular formula of the compound when A and D combine.

Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1,3,5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valencies. Write the molecular formula of the compound formed when P and S combine.

Consider two elements ‘A’ (Atomic number 17) and 'B' (Atomic number 19): (i) Write the positions of these elements in the modern periodic table giving justification. (ii) Write the formula of the compound formed when 'A' combines with 'B.' (iii) Draw the electron dot structure of the compound and state the nature of the bond formed between the two elements.

OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2- SHORT ANSWER TYPE QUESTIONS-II
  1. The position of eight elements in the modern periodic table is given b...

    Text Solution

    |

  2. Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 resp...

    Text Solution

    |

  3. From the following elements : (4)Be,(9)F,(19)K,(20)Ca (i) Select t...

    Text Solution

    |

  4. Na, Mg and Al are the elements of the same period of modern periodic t...

    Text Solution

    |

  5. The elements (4)Be,(12)Mgand(20)Ca each having two, valence electrons ...

    Text Solution

    |

  6. Two elements 'P' and 'Q' belong to the same period of the modern perio...

    Text Solution

    |

  7. The atomic number of an element 'X' is 20. (i) Determine the positio...

    Text Solution

    |

  8. Four elements P, Q, R and S belong to the third period of the Modern P...

    Text Solution

    |

  9. In the following table, the positions of six elements A, B, C, D, E an...

    Text Solution

    |

  10. The electrons in the atoms of four elements A, B, C and D are distribu...

    Text Solution

    |

  11. Based on the group valency of elements state the formula for the follo...

    Text Solution

    |

  12. Consider two elements ‘A’ (Atomic number 17) and 'B' (Atomic number 19...

    Text Solution

    |

  13. Study the following table in which positions of six elements A, B, C, ...

    Text Solution

    |

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

    Text Solution

    |

  15. An atom has electronic configuration 2, 8, 2. (i) What is the atomic...

    Text Solution

    |

  16. Two elements X and Y belong to group 1 and 2 respectively in the same ...

    Text Solution

    |

  17. Four elements A, B, C and D along with their electronic configuration ...

    Text Solution

    |

  18. Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 resp...

    Text Solution

    |

  19. Three elements X, Y and Z have atomic numbers 7, 10 and 14 respectivel...

    Text Solution

    |

  20. From the following part of the periodic table, answer the following qu...

    Text Solution

    |