EASY
8th Maharashtra Board
IMPORTANT
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Where are electrons revolving around the nucleus placed?

Important Questions on Inside the Atom

HARD
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 1
The symbol used for oxygen is ‘O’. There are 8 protons and 8 neutrons in its nucleus. From this determine the atomic number (Z) and mass number (A) of oxygen and arrange these in a conventional symbol. 
EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 2
Atomic number of carbon is 6. How many electrons are there in a carbon atom? 
EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 3
A sodium atom contains 11 electrons. What is the atomic number of sodium? 
EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 4
The atomic number and mass number of magnesium are 12 and 24 respectively. How will you show this by the convention symbol? 
EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Use your brain power>Q 5
The atomic number and mass number of calcium are 20 and 40 respectively. Deduce the number of neutrons present in the calcium nucleus.
HARD
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Complete the table
Complete the table:
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MEDIUM
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Can you recall?

Use the following molecular formulae to determine the valencies of H,Cl,O,S,N,C,Br,I,Na.

Molecular formulae of H2, HCl, H2O, H2S, NH3, CH4, HBr, HI, NaH.

 

EASY
8th Maharashtra Board
IMPORTANT
General Science>Chapter 5 - Inside the Atom>Can you tell?>Q 1
There is a similarity in the atomic structure and solar system. The planets revolve around the sun due to the gravitational force. Which force might be acting in the atomic structure?