Chemistry - 9 Chapter - 3
Atomic Structure
Test - 17

1. Rutherford allowed a beam of ______________ to fall on a thin gold foil


2. Most of the space occupied by an atom is ______________.


3. An atom is a _______________ particle


4. When electron jumps from a higher energy orbit to lower energy orbit, it __________ energy


5. E2 - E1 =___________________.


6. The number of protans present in the nucleus of an atom is called its______________ or ______________.


7. Atoms of an element having same atomic number but different mass number are called_______________.


8. Atoms of an element possess




9. In gas discharge tube the pressure of gas inside the tube was maintained at




10. Atoms of different elements have?




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