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Protrons and neutrons have almost the sa...

Protrons and neutrons have almost the same mass.

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Do protons and electrons have same mass?

Q 4 Two atoms are said to be isobars if. * (a) they have same atomic number but different mass number. (b) they have same number of electrons but different number of neutrons (c) they have same number of neutrons but different number of electrons. (d) sum of the number of protons and neutrons is same but the number of protons is different.

Knowledge Check

  • The mass of an atom is due to the masses of protons and neutrons in the nucleus. The relative masses of protons and neutrons are almost equal to one. Therefore, the atomic mass of an element should be nearly a whole number. But in many cases the atomic masses are fractional. The main reason for these fractional atomic masses is that these elements occur in nature as a mixture of several isotopes. The atomic mass of an element is the average of the atomic masses of these isotopes in the ratio of their proportion of occurrence. The fractional atomic masses of elements are due to the existence of

    A
    isotopes having different masses
    B
    diagonal relationship
    C
    equal number of electrons and protons
    D
    none of these.

  • The mass of an atom is due to the masses of protons and neutrons in the nucleus. The relative masses of protons and neutrons are almost equal to one. Therefore, the atomic mass of an element should be nearly a whole number. But in many cases the atomic masses are fractional. The main reason for these fractional atomic masses is that these elements occur in nature as a mixture of several isotopes. The atomic mass of an element is the average of the atomic masses of these isotopes in the ratio of their proportion of occurrence. An element occurs in two isotopic forms with atomic masses 10 and 11. What is the percentage abundance of two isotopes in the sample having atomic mass 10.80?

    A
    20,80
    B
    50,50
    C
    25,70
    D
    60, 40

  • Definig 1 amu as 1//12 of the mass of a ._(6)^(12)C atom means that protons and neutrons each have a mass of almost exactly 1 amu, because

    A
    atin as a whole is electrically neutral
    B
    `C` atom contains equal number of protons and neutrons
    C
    the mass of an electron is negligibel compared with the mass of proton and neutron
    D
    neutrons are slightly heavier than protons

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    Consider the following statements- I. Isotopes are atoms having same number of protons but different number of neutrons. II. Isotopes are atoms having same number of neutrons but different number of protons. III Isotopes are atoms having same number of protons and neutrons. Choose the correct statement.

    The sum of protons and neutrons is same in ______.

    The sum of protons and neutrons is same in _____

    Assertion : All the three isotope of hydrogen have almost the same chemical properties. Reason : Isotopes differ from one another in respect of the presence of neutrons.

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