Home
Class 10
CHEMISTRY
Lithium is an alkali metal with atomic n...

Lithium is an alkali metal with atomic number = 3 and number of valence electrons = 1. The formula of the hydride of lithium is LiH. Boron and carbon are placed in group 13 and 14 respectively with valence electrons 3 and 4. Write the formulae of the hydrides of boron and carbon giving a reason for your answer.

Text Solution

Verified by Experts

Formula for a hydride of boron is `BH_3` and hydride of carbon is `CH_4` Since boron has 3 valence electrons and hydrogen has one, their compound has the formula BH, Since carbon has 4 valence electrons its compound with hydrogen has the formula `CH_4`
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    ZEN PUBLICATION|Exercise ZEE ADDITIONAL QUESTIONS SECTIONS (LONG ANSWER (LA) TYPE QUESTIONS)|6 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    ZEN PUBLICATION|Exercise ZEE ADDITIONAL QUESTIONS SECTIONS (HIGHER-ORDER THINKING SKILLS (HOTS))|9 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    ZEN PUBLICATION|Exercise ZEE ADDITIONAL QUESTIONS SECTIONS (VERY SHORT ANSWER (VSA) TYPE QUESTIONS)|29 Videos

  • METALS AND NON METALS

    ZEN PUBLICATION|Exercise ZEN ADDITIONAL QUESTIONS SECTION (LONG ANSWER [LA] TYPE 2 QUESTIONS)|14 Videos

Similar Questions

Explore conceptually related problems

(i) Atomic number of Mg and Al are 12 and 13, respectively. Write down their electronic configuration. (ii) Mention the period of the modern periodic table to which the above two elements belong. Give reason for your answer.

Three elements X, Y and Z belong to 17^(th) group but 2^(nd),3^(rd)and4^(th) period respectively. Number of valence electrons in Y is 7. Find the number of valence electrons in X and Z.

The atomic number of an element is 16. predict 1) The number of valence electrons in its atom. 2) Its valency. 3) Its group number 4) Whether it is a metal or a non metal. 5) The nature of oxide formed by it. 6) The formula of its chloride.

(i) Element 'Y' with atomic number 3 combines with element 'A' with atomic number 17. What would be the formula of the compound ? (ii) What is the electronic configuration of an element with atomic number 10 ? What will be its valency?

The quantum numbers for the valence electron of an atom are n=3,l=0,m=0, s=+1//2 The element is

Na, Mg, and Al are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2, and 13 respectively. Which one of these elements has the a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity?

The atomic number of.an elements is 16. Predict 1. The number of valence electron in its atom 2 Its valency. 3. Its group number. 4. Whether it is a metal or a non metal.

Two elements 'P' and 'Q' belong to the same period of the modern periodic table and are in Group -1 and Group -2 respectively. Compare their following characteristics in tabular form: (i) The number of electrons in their atoms (ii) The sizes of their atoms (iii) Their metallic characters (iv) Their tendencies to lose electrons (v) The formula of their oxides (vi) The formula of their chlorides

An element ‘M’ has atomic number 11. a) Write its electronic configuration. b) State the group to which ‘M’ belongs c) is 'M' a metal or a non - metal ? d) Write the formula of its chloride.

a] What are metalloids? Write any two examples. b] Given below are some of the elements of the first group: Li, Na, K (their atomic numbers are 3, 11, and 19 respectively and they belong to 2nd, 3rd, and 4th period respectively). Arrange them in the decreasing order of their metallic character.

ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
  1. Consider the part of the periodic table given below and answer the fol...

    Text Solution

    |

  2. An element Y has three shells with four electrons in the valence shell...

    Text Solution

    |

  3. Lithium is an alkali metal with atomic number = 3 and number of valenc...

    Text Solution

    |

  4. An element X (atomic number 17) reacts with an element Y (atomic numbe...

    Text Solution

    |

  5. An element P (atomic number 20) reacts with an element Q (atomic numbe...

    Text Solution

    |

  6. Arrange giving reason the following elements in the increasing order o...

    Text Solution

    |

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

    Text Solution

    |

  8. Justify the following statements: a) Cations are smaller in size th...

    Text Solution

    |

  9. Give reasons for the following: a] Metals have a tendency to form ca...

    Text Solution

    |

  10. Given below are some elements of the Modern Periodic Table: ""(4)Be,...

    Text Solution

    |

  11. An element M with electronic configuration (2,8, 2) combines separatel...

    Text Solution

    |

  12. Na, Mg, and Al are the elements of the 3rd period of the Modern Period...

    Text Solution

    |

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

    Text Solution

    |

  14. An element A reacts with oxygen to form A2O.  i] State the number of...

    Text Solution

    |

  15. An element has same number of electrons in I and IV shells and in the ...

    Text Solution

    |

  16. i] An element X has both K and L shells completely filled with electro...

    Text Solution

    |

  17. From the part of the periodic table answer the following questions. ...

    Text Solution

    |

  18. An element X placed in 2nd group and 4th period of periodic table burn...

    Text Solution

    |

  19. The position of three elements A, B and C in the periodic table is sho...

    Text Solution

    |

  20. An element X has mass number 35 and number of neutrons = 18. Write ato...

    Text Solution

    |