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: Neutrons Electrons Protons Isotopes 2. The electrons in the outermost shell of an atom are called: Core electrons Neutron electrons Orbital electrons Valence electrons 3. Who discovered the neutron? J.J. Thomson Niels Bohr James Chadwick Ernest Rutherford 4. What is the charge of a neutron? Positive Variable Neutral Negative 5. The nucleus of an atom is held together by the: Strong nuclear force Electrons Neutrons Protons 6. The number of protons in an atom determines its: Atomic number Atomic mass Mass number Valence electrons 7. Which of the following particles has the least mass? Electron Proton Neutron Positron 8. Who proposed the plum pudding model of the atom? James Chadwick Niels Bohr Ernest Rutherford J.J. Thomson 9. An atom becomes an ion when it: Loses or gains neutrons Loses or gains electrons Loses or gains protons 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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