Periodic Classification - Chapter No 9

Right Answers have been shown below in red color.

1. The process to arrange the elements in specific order is called ____________.

a) Classification
b) Arithmetic
c) Volume
d) Pressure

2. In these days, the classification of elements is based on ___________ numbers of the elements.

a) Classification
b) Atomic
c) Molecular
d) None of these

3. The Triad system was introduced by ___________ in 1817.

a) Mayer
b) Newland
c) Dobereiner
d) Mendeleev

4. According to Dobereiner’s laws, “The atomic mass of middle element of the triad is approximately the ___________ of the atomic masses of the other two elements”.

a) Negative
b) Positive
c) Simple
d) Average

5. The law of octaves was introduced by ___________ in 1866.

a) Dobereiner
b) Maxwell
c) Newland
d) Cathey

6. Mendeleev was introduced his periodic law in ___________.

a) 1869
b) 1875
c) 1904
d) 1709

7. According to Mendeleev’s periodic law, “The properties of elements were the ___________ function of their atomic masses”.

a) Modern
b) Periodic
c) Mass
d) None of these

8. Mendeleev’s periodic table deals with the ___________.

a) Prediction of new elements
b) Prediction of old elements
c) Modern theories
d) None of these

9. Mendeleev placed Argon (40) before ___________.

a) Carbon (6)
b) Nitrogen (9)
c) Potassium (39)
d) Iodine (126.9)

10. Atomic number was introduced by ___________ in 1913.

a) Moseley
b) Maxwell
c) Joule
d) Henry

11. The wavelength of x-rays decreases with the ___________ of the atomic number of elements.

a) Decreases
b) Increases
c) Space
d) Function

12. According to modern periodic law, “The physical and chemical properties of elements are the periodic function of their ___________”

a) Molecular number
b) Atomic number
c) International
d) Wavelength

13. The horizontal rows in the periodic table are called ___________.

a) Periods
b) Groups
c) Isotopes
d) None of these

14. The vertical columns in the periodic table are called ___________.

a) Periods
b) Groups
c) Metals
d) Actinides

15. There are ___________ periods in periodic table.

a) Five
b) Four
c) Seven
d) Nine

16. The first period consists of ___________ elements.

a) Four
b) Three
c) Two
d) Nine

17. There are ___________ groups in periodic table.

a) Eight
b) Seven
c) Six
d) Four

18. The 6th period consists of ___________ elements.

a) 23
b) 32
c) 12
d) 9

19. The 4th and 5th periods are called ___________ periods.

a) long
b) Short
c) Small
d) Series

20. The further divided groups are called ___________.

a) Isotopes
b) Sub-groups
c) Zero group
d) electrons

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