9th Class Science Structure of the Atom Question Bank

done Atomic Structure Summative Subjective Problems Total Questions - 15

• question_answer1)
                                                  Identify the following from their description. (a) These are the rays produced in the discharge tube. These rays deflect towards the +ve plate in an electric field, and contain the universal constituent of matter. (b) This is a subatomic particle present in all the atoms except Hydrogen. (c) These are rays used by James Chadwick and Rutherford for their important experiments to understand the structure of an atom.
  View Solution play_arrow

• question_answer2)
  Find the number of electrons whose mass is equal to the total mass of neutrons present in one calcium atom.
  View Solution play_arrow

• question_answer3)
  Why is Rutherford's atomic model called nuclear model. Solar model respectively?
  View Solution play_arrow

• question_answer4)
  What is the purpose of lead block and ZnS in Rutherford's gold foil experiment?
  View Solution play_arrow

• question_answer5)
  'x' is the unit used to measure the atomic particles and 'y' is the S.I. unit of mass. Find y/x.
  View Solution play_arrow

• question_answer6)
  What is the amount of charge in coulomb's present on stable oxide ion?
  View Solution play_arrow

• question_answer7)
  1 Coulomb = _____ electrons.
  View Solution play_arrow

• question_answer8)
  An atom has mass number A and atomic number Z: (a) How many protons are present in the nucleus? (b) How many electrons revolve around the nucleus? (c) How many neutrons are present in the nucleus?
  View Solution play_arrow

• question_answer9)
  The electronic configuration of a tripositively charged ion\[({{X}^{+3}})\]is 2, 8. Then (a) Identify the element and find the number of neutrons in it. (b) Write the formula of the compound that it forms with chlorine and oxygen respectively. (c) Name the element whose dinegatively charged ion is isoelectronic with\[{{X}^{+3}}\]. (d) What is the valency of 'X' ? Name the group in periodic table to which it belongs. (e) Find the number of 'M' electrons present in its neutral atom.
  View Solution play_arrow

• question_answer10)
  What is the formula of the compound formed by P and Q if the number of electrons present in their outermost shells (M-shell) is 3 and 7 respectively?
  View Solution play_arrow

• question_answer11)
  Why does atomic number not change during a chemical reaction?
  View Solution play_arrow

• question_answer12)
  The ratio of mass of one atom of nitrogen to its atomic weight is x. The ratio of mass of one atom of calcium to its atomic weight is y. Find x / y.
  View Solution play_arrow

• question_answer13)
  What is the charge present on an atom containing 8 protons, 10 neutrons and 10 electrons?
  View Solution play_arrow

• question_answer14)
                  The atomic number of elements P, Q and R are 7, 11, 15 respectively. State with a reason which two elements are likely to have same chemical properties?
  View Solution play_arrow

• question_answer15)
  (a) The valence electrons in three elements R, A, J was found to be 1, 2, 3 respectively. Then, predict the nature of R, A, J. (b) The valence electrons in four elements A, R, T, I was found to be 4, 5, 6, 7 respectively. Then, predict the nature of A, R, T, I. (c) Identify an element which has one electron in K-shell but is a non-metal. (d) Identify an element that has two electrons in K-shell (other shells are empty, but is a noble gas.
  View Solution play_arrow