Structure Of Atom(General Knowledge > General Science ) Questions and Answers

Question 1. For principal quantum number n=4, the total number of orbitals having l=3 is
  1.    3
  2.    5
  3.    7
  4.    9
Explanation:-
Answer: Option C. -> 7
Question 2. Which is the isotone of 32Ge76 (atomic numberXmass number)
  1.    32Ge77
  2.    34Ge78
  3.    36Ge79
  4.    32Ge78
Explanation:-
Answer: Option B. -> 34Ge78
Question 3. Uncertainity in the position of an electron (mass= 9
  1.    5.76 x 10-2 m
  2.    1.92 x 10-2 m
  3.    3.84 x 10-2 m
  4.    19.2 x 10-2 m
Explanation:-
Answer: Option B. -> 1.92 x 10-2 m
Question 4. Which of the following is isoelectronic with Ca2+
  1.    Fe3+
  2.    S2-
  3.    Mg2+
  4.    P
Explanation:-
Answer: Option B. -> S2-
Question 5. The sub-shell with n=6, l=2 can accomodate a maximum of
  1.    10 electrons
  2.    12 electrons
  3.    36 electrons
  4.    72 electrons
Explanation:-
Answer: Option A. -> 10 electrons
Question 6. Which of the following has the maximum number of unpaired d-electrons?
  1.    Ni3+
  2.    Cu+
  3.    Zn2+
  4.    Fe2+
Explanation:-
Answer: Option D. -> Fe2+
Question 7. The positive particles of an atom are
  1.    electrons 
  2.    positrons 
  3.    neutrons 
  4.    protons 
Explanation:-
Answer: Option D. -> protons 
Question 8. All matter is made of what
  1.    energy 
  2.    atoms 
  3.    electrons 
  4.    compounds 
Explanation:-
Answer: Option B. -> atoms 
Question 9. How many electrons are in the element oxygen?
  1.    7
  2.    10
  3.    8
  4.    9
Explanation:-
Answer: Option C. -> 8
Question 10. What is the atomic number for an element with three protons?
  1.    2
  2.    1
  3.    3
  4.    6
Explanation:-
Answer: Option C. -> 3
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