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MCQs

Total Questions : 166 | Page 13 of 17 pages
Question 121. All ions of an element have the same
  1.     atomic number.
  2.     number of electrons.
  3.     number of protons.
  4.     both option A. and C.
 Discuss Question
Answer: Option D. ->  both option A. and C.
Question 122. The number of rings in the Bohr model of any element is determined by what?
  1.     Atomic number.
  2.     Row number on periodic table.
  3.     Atomic mass.
  4.     Column number on periodic table.
 Discuss Question
Answer: Option B. ->  Row number on periodic table.
Question 123. Almost the entire mass of an atom is concentrated in the
  1.     nucleus.
  2.     electrons.
  3.     neutrons.
  4.     protons.
 Discuss Question
Answer: Option A. ->  nucleus.
Question 124. According to the Bohr model, an electron gains or losses energy only by
  1.     being completely removed from an atom.
  2.     jumping from one atom to another atom.
  3.     jumping from one allowed orbit to another.
  4.     moving faster or slower in an allowed orbit.
 Discuss Question
Answer: Option C. ->  jumping from one allowed orbit to another.
Question 125. How many valence electrons would be found in an atom with the atomic number of 51?
  1.     5.
  2.     8.
  3.     none of above.
  4.     51.
 Discuss Question
Answer: Option A. ->  5.
Question 126. The Bohr model of the atom
  1.    All of these
  2.     had some made-up rules without explanations.
  3.     explained the color lines in the hydrogen spectrum.
  4.     could not explain the line spectrum of atoms larger than hydrogen.
 Discuss Question
Answer: Option C. ->  explained the color lines in the hydrogen spectrum.
Question 127. Maximum number of electrons in a sub-shell with l = 3 and n = 4 is
  1.     10.
  2.     20.
  3.     8.
  4.     14.
 Discuss Question
Answer: Option D. ->  14.
Question 128. Two different isotopes of an element have different
  1.     atomic number.
  2.     numbers of neutrons.
  3.     numbers of protons.
  4.     numbers of electrons.
 Discuss Question
Answer: Option B. ->  numbers of neutrons.
Question 129. Which of the following statements is not part of Daltons atomic theory?
  1.     Atoms can combine to form compounds.
  2.     All matter is composed of atoms.
  3.     An atom contains a dense central nucleus.
  4.     Atoms of different elements are quite different.
 Discuss Question
Answer: Option C. ->  An atom contains a dense central nucleus.
Question 130. The electron configuration of sulfur atom is
  1.     2, 8, 2.
  2.     1s2 , 2s2 2p6, 3s2 3p6.
  3.     none of these.
  4.     2, 8, 6.
 Discuss Question
Answer: Option D. ->  2, 8, 6.

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