ELECTRONIC STRUCTURE MULTIPLE CHOICE TEST

 Read the questions carefully and choose the letter of the correct answer.
1. On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?
          a. proton and electron                       c. proton and neutron
          b. neutron and electron                     d. proton only

2. If the first and second energy levels of an atom are full, then what would be the total number of electrons in the atom?
          a. 6              b. 8           c. 10             d.18

3. Which atomic model is proposed by Schrodinger?
          a. nuclear model
          b. planetary model
          c. raisin bread model
          d. quantum mechanical model

4. Which electron transition results in the emission of energy?
          a. 3p to 3s                                        c. 2s to 2p
          b. 3p to 4p                                       d. 1s to 2s

5. The symbol “n” in the Bohr theory of atomic structurerefers to
          a. the energy of electron
          b. the total energy of the atom
          c.  the number of electron in an energy level
          d. the orbit in which an electron is found.

6. Which of the following sublevels is correctly designated?
          a. 1p5           b. 3f9           c. 2p6          d. 3d11

7. How many orbitals are in the third principal energy level?
          a. 3               b. 6              c. 9              d.  12

8. Which configuration is possible in an excited state of electron?
          a.  2He : 1s2
          b.  1H: 1d1
          c. 11Na: 1s2 2s2 2p6  3d1
          d. 10Ne: 1s2 2s2 2p5 3s1

9. What are the orbitals present in the fifth principal energy level?
          a. s orbital           b. s, p orbitals         c. s, p, d orbitals         d. s, p, d, and f orbitals

10.  For  a  neutral  atom  with  the  electron  configuration  of  1s2 2s2  2p5 3s1,  which statement is false?
          a. The atomic number is ten.
          b. The 1s and 2s orbitals are filled
          c. The atom is in the ground state.
          d. The atom is in the excited state

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11. Who proposed the probability that electrons will be found in certain locations around the nucleus of an atom?
          a. Neils Bohr                                    c. Ernest Rutherford
          b. Erwin Schrodinger                       d. J.J. Thomson

12. Which of the following statements is NOT true of the atomic model of Bohr?
          a. The hydrogen is made up of a positively charged nucleus
          b. The electron revolves around the nucleus in a circular orbit.
          c. The energy of the electron in a given orbit is not fixed.
          d. An electron can absorb or emit a quantity of radiation.

13. Which orbital designation has the highest energy?
          a. 2s             b. 2p                    c. 3d             d. 4s

14. Which statement is incorrect?
         a. Orbital is a region in an atom where an electron can be found.
         b. An electron can absorb energy when it jumps to a higher energy level.
         c. An electron can emit energy when it jumps to a higher energy level.
         d.  Filling  of  electrons in  an  atom  starts from  a  low  energy  level  to  the highest energy                     level.

15. What occurs when an electron moves from high energy level to a low one?
           a. another electron goes from a low energy level to a high one
           b. the atom moves faster
           c. colored light is given off
           d. this process is not possible

16. Which combination describes the flame color of the compound when heated?
          a. sodium chloride –orange                     c. potassium chloride –blue
          b. copper(II) sulfate –violet                     d. boric acid –red


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