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MCQs

Total Questions : 622 | Page 58 of 63 pages
Question 571. Chlorine's (Cl) relative atomic mass is 35.5. this half number is due to
  1.    isotopes
  2.    a half proton
  3.    a half neutron
  4.    a half electron
 Discuss Question
Answer: Option A. -> isotopes
Answer: (a).isotopes
Question 572. In an atom, number of protons and neutrons are added to obtain
  1.    number of electrons
  2.    number of nucleons
  3.    atomic number of element
  4.    number of positrons
 Discuss Question
Answer: Option B. -> number of nucleons
Answer: (b).number of nucleons
Question 573. If nucleon number of potassium is 39, number of neutrons will be
  1.    39
  2.    19
  3.    20
  4.    29
 Discuss Question
Answer: Option C. -> 20
Answer: (c).20
Question 574. If proton number is 19, electron configuration will be
  1.    2,8,7
  2.    2,8,18
  3.    2,8,8,1
  4.    2,8,8,3
 Discuss Question
Answer: Option C. -> 2,8,8,1
Answer: (c).2,8,8,1
Question 575. All are noble gases except
  1.    Helium
  2.    Neon
  3.    Argon
  4.    Xeon
 Discuss Question
Answer: Option A. -> Helium
Answer: (a).Helium
Question 576. First element in periodic table to have 8 valence electrons is
  1.    nitrogen
  2.    oxygen
  3.    fluorine
  4.    neon
 Discuss Question
Answer: Option D. -> neon
Answer: (d).neon
Question 577. Full shell of valence electrons make
  1.    metals
  2.    non metals
  3.    inert gases unreactive
  4.    isotopes
 Discuss Question
Answer: Option C. -> inert gases unreactive
Answer: (c).inert gases unreactive
Question 578. Proton number of Fluorine (F) is 9, electron number is
  1.    2,5
  2.    2,7
  3.    2,9
  4.    2,6
 Discuss Question
Answer: Option B. -> 2,7
Answer: (b).2,7
Question 579. Energy levels of electrons are also called as
  1.    shells
  2.    orbits
  3.    gases
  4.    Photons
 Discuss Question
Answer: Option A. -> shells
Answer: (a).shells
Question 580. In periodic table, number of valence electron is one, in
  1.    Group-I
  2.    Group-II
  3.    Group-III
  4.    Noble gases
 Discuss Question
Answer: Option A. -> Group-I
Answer: (a).Group-I

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