Chemistry - 9 Chapter - 4Periodicity of Elements and Periodic TableTest - 6

Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 6

1. Atomic mass of all isotopes of an element is _______?

a) Different
b) Same

2. Atomic numbers of all isotopes of an element is __?

a) Same
b) Different

3. Colour of the hair of people differs due to the presence of isotopes?

a) True
b) False

4. Due to isotopes one element may have two ____?

a) Ions
b) Atomic numbers
c) Radicals
d) Atomic masses

5. Periodic table was arranged on the bases of atomic numbers and not atomic masses after the discovery of _____?

a) Radicals
b) Noble gases
c) Ions
d) Isotopes

6. The most reactive non-metal is:

a) Flourine
b) Oxygen
c) Chlorine
d) Phosphorus

7. Why it is not suitable to arrange the elements on the bases of atomic masses in the periodic table?

a) The isotopes of an element have different atomic mass and require separate positions in the periodic table
b) The isotopes of an element have same atomic mass and require same positions in the periodic table
c) The isotopes of an element have same atomic mass and require separate positions in the periodic tablems
d) The isotopes of an element have different atomic mass and require same positions in the periodic table

8. Atoms can exist in isolated form.

a) True
b) False

9. By gaining one more electrons the element becomes?

a) Positive
b) Negative
c) Neutral

10. Define periodic table?

a) Periodic table is a systematic arrangement of elements which is obtained by placing similar elements in different groups.
b) Periodic table is a random arrangement of elements which is obtained by placing similar elements in same groups.
c) Periodic table is a systematic arrangement of elements which is obtained by placing similar elements in same groups.

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