Unit Test Standard 9

 

STANDARD 9 UNIT TEST

STRUCTURE OF ATOM

1. Which particle in an atom is having positive charge?

a. proton

b. electron

c. neutron

d. none of these

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2.The symbol of an element is P .

13

Find the number of neutrons.(Write only number)

3.Who discovered electron?

4.Who introduced atomic theory?

5.Electronic configuration of an element is 2 8 5. What is its atomic number?

6. The maximum number of electrons that can be accomodated in the outermost shell of an atom?

7.Name the shell closest to the nucleus.

8.. Bohr model of an atom is given. Find its

a. Atomic number

b. Number of shells

c.Number of electrons in the outermost shell