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प्रश्न
What are the two main parts of which an atom is made of?
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उत्तर
- The centrally located nucleus
- The outer circular orbits.
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संबंधित प्रश्न
Give the following a suitable word/phrase.
The electrons present in the outermost shell.
FILL IN THE BLANK
The electrons revolving in shells close to the nucleus are called ................... electrons.
Tick the most appropriate answer.
In 1908, R A Millikan found the charge of an electron to be
- 1.6 x 10-19 C
- 1.6 x 10-15 C
- 1.4 x 10-19 C
- 1.6 x 19-16 C.
Tick the most appropriate answer
β-particles are actually a stream of
- protons
- electrons
- neutrons
- none of these
WRITE SHORT ANSWER
What is an atom?
WRITE SHORT ANSWER
What is the number of neutrons present in a potassium atom ?
Draw the electronic configuration of the following elements clearly stating the number of neutrons and protons in their nucleus.
a. Beryllium b. Silicon
c. Chlorine d. Aluminium
e. Nitrogen
State its one drawback of Rutherford’s atomic model.
Explain how the modern atomic theory contradicted Dalton’s atomic theory.
What is meant by the term subatomic particles?
