Chemistry - 9 Chapter - 3
Atomic Structure
Test - 21

1. The circular path of an electron around the nucleus is called a shell.


2. Mass of electron is 9.1095 x 10-31 kg and carries a negative charge -1.602 x 10 -19 C .


3. There is no Neutron in the nucleus of Hydrogen atoms


4. An atom cannot be broken by any means.


5. Isotope are atoms of an element having the same atomic number but different mass number.


6. Number of neutrons in atoms of same element can be different but it cannot happen in the case of protons?


7. Total 109 elements exist which include 92 natural and 17 artificial


8. Element is a substance in which all atoms are similar, having same atomic mass.


9. Up till now almost 92 radioactive materials have been discovered.


10. Radium is more radioactive than uranium?


11. Alpha-rays are positively charged particles


12. Beta Rays are actually electrons.


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