Modern Periodic Law and the Present Form of the Periodic Table MCQs with FREE PDF

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Modern Periodic Law and the Present Form of the Periodic Table MCQs

1. Henry Moseley’s law is given by the equation v? = a(Z – b). What do a and b represent here?

a) The proportionality constant, screening constant

b) Screening constant, proportionality constant

c) Absorption constant, proportionality constant

d) screening constant, Boltzmann constant

Answer: The proportionality constant, screening constant

2. The horizontal rows in Mendeleev’s periodic table were called as __________

a) periods

b) groups

c) series

d) rows

Answer: series

3. In the modern long-form of periodic table, the horizontal rows and the vertical columns are called as __________ and ___________ respectively.

a) groups, periods

b) periods, groups

c) rows, columns

d) columns, rows

Answer: periods, groups

4. The period’s number corresponds to the highest _________

a) Azimuthal quantum number

b) Spin quantum number

c) Magnetic quantum number

d) Principal quantum number

Answer: Principal quantum number

5. Which was the incomplete period in the long-form of the modern periodic table?

a) 7th period

b) 4th period

c) 6th period

d) 2nd period

Answer: 7th period

6. Which of the following period is the shortest one?

a) 1

b) 3

c) 2

d) 4

Answer: 1

7. ____________ observed the X-rays’ characteristics.

a) Henry Moseley

b) Mendeleev

c) Pauli

d) Newland

Answer: Henry Moseley

8. The graph of v? Vs Z gives a straight line.

a) True

b) False

Answer: True

9. The physical and chemical properties of an element are the periodic function of its _________

a) Atomic mass

b) Element behaviour

c) No of electrons

d) Atomic number

Answer: Atomic number

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