Chemistry 9 Chapter 3Periodic Table and Periodicity of Properties - 1

Chemistry 9 Chapter 3
Periodic Table and Periodicity of Properties - 1

1. How many elements were known by the end of 18th century?

a) 65
b) 23
c) 88
d) 109

2. How many elements were known by the end of 19th century?

a) 88
b) 23
c) 109
d) 65

3. Elements combine to form?

a) Compounds
b) Electrons
c) Atoms
d) Protons

4. By 1925, the total elements known were?

a) 23
b) 109
c) 88
d) 65

5. How many total elements are known today?

a) 109
b) 23
c) 65
d) 88

6. Which one of the following is the discoverer of atomic number?

a) Empedocles
b) Rutherford
c) Bohr
d) Moseley

7. The atomic number was discovered in?

a) 1890
b) 1913
c) 1900
d) 1911

8. The elements in the periodic table are arranged in the order of?

a) decreasing atomic number
b) increasing mass number
c) increasing atomic number
d) decreasing mass number

9. A table that shows a systematic arrangement of elements is known as?

a) column table
b) periodic table
c) group table
d) none of these

10. If the elements are arranged in the order of their increasing atomic numbers, their properties are repeated in a periodic manner. It is known as?

a) Bohr's law
b) Ohm's law
c) Periodic law
d) Newton's law

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