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ایٹم کی ساخت

نویں جماعت · کیمیا · 6 سوالات

نام: ____________________   تاریخ: ____________

  1. Which particle in an atom has a negative charge?

    • A Nucleus
    • B Neutron
    • C Electron
    • D Proton

  2. The atomic number of an element is the number of:

    • A Neutrons
    • B Protons
    • C Shells
    • D Protons plus neutrons

  3. An atom has 11 protons and 12 neutrons. What is its mass number?

    • A 12
    • B 1
    • C 23
    • D 11

  4. Atoms of the same element with different numbers of neutrons are called:

    • A Isomers
    • B Isotopes
    • C Isobars
    • D Ions

  5. What is the electronic configuration of sodium (atomic number 11)?

    • A 8, 3
    • B 2, 9
    • C 2, 8, 2
    • D 2, 8, 1

  6. Which scientist discovered the nucleus?

    • A Bohr
    • B Dalton
    • C Rutherford
    • D Thomson

جوابی کلید

1. C, 2. B, 3. C, 4. B, 5. D, 6. C

  1. Electrons carry a negative charge.

  2. The atomic number equals the number of protons.

  3. Mass number = protons + neutrons = 11 + 12 = 23.

  4. These are isotopes: same atomic number, different mass number.

  5. Fill shells 2, 8, then the remaining 1 electron goes in the third shell.

  6. Rutherford's gold foil experiment showed that atoms have a small dense nucleus.