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 4 ) 1. Who proposed that electrons move in electron clouds rather than fixed orbits? Niels Bohr J.J. Thomson Ernest Rutherford Erwin Schrödinger 2. An atom with a positive charge is called a: Cation Isotope Neutron Anion 3. The number of neutrons in an atom can vary, resulting in different: Mass numbers Atomic numbers Valence electrons Isotopes 4. What is the charge of an electron Positive Neutral Variable Negative 5. The mass number of an atom is equal to the sum of the number of: Protons, neutrons, and electrons Neutrons and protons Protons and electrons Neutrons and electrons 6. The Bohr model of the atom is based on the concept of: Orbitals Electron shells Electron clouds Nucleus 7. The atomic number of an element is equal to the number of: Isotopes Electrons Neutrons Protons 8. Which subatomic particle is responsible for holding the nucleus together? Neutron Positron Proton Electron 9. The number of protons in an atom determines its: Atomic number Valence electrons Atomic mass Mass number 10. An atom that has gained or lost electrons is called: An isotope An ion A molecule A compound Loading … Pages: 1 2 3 4 5
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