GENERAL SCIENCE CLASS 7 Chapter 6: Structure of an Atom Class 7 MCQS by Shoaib GabolFebruary 2, 2024March 20, 2024 Structure of an Atom ( PART 3 ) 1. The atomic mass of an element is the weighted average of the masses of its: Protons Neutrons Electrons Isotopes 2. The electrons in the outermost shell of an atom are called: Orbital electrons Neutron electrons Core electrons Valence electrons 3. Who discovered the neutron? James Chadwick J.J. Thomson Ernest Rutherford Niels Bohr 4. What is the charge of a neutron? Variable Neutral Negative Positive 5. The nucleus of an atom is held together by the: Electrons Protons Neutrons Strong nuclear force 6. The number of protons in an atom determines its: Atomic number Valence electrons Mass number Atomic mass 7. Which of the following particles has the least mass? Proton Positron Neutron Electron 8. Who proposed the plum pudding model of the atom? Ernest Rutherford J.J. Thomson Niels Bohr James Chadwick 9. An atom becomes an ion when it: Loses or gains protons Loses or gains electrons Loses or gains neutrons Loses or gains positrons 10. The atomic mass of an element is measured in: Liters Grams Milliliters Atomic mass units (amu) Loading … Pages: 1 2 3 4 5
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