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प्रश्न
Fill in the blank
Neutrons are .......................... particles having mass equal to that of protons.
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उत्तर
Neutrons are neutral particles having mass equal to that of protons.
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संबंधित प्रश्न
Fill in the blank
The outermost shell of an atom is known as............................
Give the following a suitable word/phrase.
The smallest unit of an element which takes part in a chemical reaction.
Multiple Choice Questions
number of valence electrons present in magnesium is
FILL IN THE BLANK
The γ-rays are............................ radiations, like light.
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
ANSWER IN DETAIL
What is the maximum number of electrons that L shell can accommodate ? Give reasons for your answer.
ANSWER IN DETAIL
Write a note on valence shell.
Explain how the modern atomic theory contradicted Dalton’s atomic theory.
Explain in brief – Goldstein’s experiment which led to the discovery of the proton.
If an atom ‘A’ has an atomic number of eleven, state the number of protons and electrons it contains.
