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प्रश्न
Define the term Atomic number.
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उत्तर
Atomic number refers to the number of protons present in an atom. It is denoted by Z. Example: An atom of oxygen contains 8 proton Therefore its atomic number is 8.
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संबंधित प्रश्न
Give the following a suitable word/phrase
The sub-atomic particle with negative charge and negligible mass.
Multiple Choice Questions
The outermost shell of an atom is known as
Tick the most appropriate answer.
Which of the following scientists observed that cathode rays consists of negatively charged particles?
- John Dalton
- J J Thomson
- James Chadwick
- Democritus
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.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
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What is the number of neutrons present in a potassium atom ?
Which of the following statement is always correct?
Explain how the modern atomic theory contradicted Dalton’s atomic theory.
State how electrons are distributed in an atom. Explain in brief the rules which govern their distribution.
