Home
Class 10
CHEMISTRY
Lithium, sodium and potassium form a Dob...

Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.

Text Solution

Verified by Experts

Atomic mass of Na = `(7+39)/2=46/2=23`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC:1- SHORT ANSWER TYPE QUESTIONS-I|4 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC:1- SHORT ANSWER TYPE QUESTIONS-II|13 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAAL PUBLICATION|Exercise TOPIC:1- MATCH THE COLUMN|1 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

Chlorine, Bromine and Iodine form a Dobereiner’s triad. The atomic masses of Chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of Bromine.

In a triad of three elements A, B, and C, the atomic mass of A and B are 80 and 120 respectively. Find the atomic mass of element C.

Knowledge Check

  • Two elements X and Y have the same atomic mass but this atomic number are 20 and 21 respectively X and Y are

    A
    Isobar
    B
    Isotopes
    C
    Isomere
    D
    Isotones

  • Given that the abundance of isotopes "^54Fe , "^56Fe and "^57Fe are 5%, 90% and 5% respectively, the atomic mass of Fe is

    A
    55.85
    B
    55.95
    C
    55.75
    D
    56.05

  • Vapour density of a gas is 40. Its specific heats at constant pressure and volume are 0.115 and 0.082 respectively. The atomic mass of the gas is

    A
    40
    B
    20
    C
    80
    D
    None

    • Similar Questions

    Explore conceptually related problems

    The atomic number and atomic mass of iron are 26 and 56 respectively.Find the number of protons and neutrons in its atom.

    a] Lithium, sodium, and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? b] Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

    The three stable isotopes of neon: ""_(10)^(20)Ne,""_(10)^(21)Ne and ""_(10)^(22)Ne have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.

    Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. (a) Is there any similarity in the atoms of these elements?

    The nucleides X and Y are isotonic to each other with mass numbers 70 and 72 respectively. If the atomic number of X is 34, then that of Y would be

    Home
    Profile