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प्रश्न
Multiple Choice Questions
The outermost shell of an atom is known as
पर्याय
valency
valence electrons
nucleus
valence shell
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उत्तर
valence shell
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संबंधित प्रश्न
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Gases become good conductors of electricity under ........ (low/high) pressure and .............. (low/high) voltage electrical discharge.
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In an atom, the last shell containing electrons is called its..................shell.
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.
WRITE SHORT ANSWER
What do you mean by electron transition?
WRITE SHORT ANSWER
What is the number of neutrons present in a potassium atom ?
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
Name the three fundamental particles of an atom.
Explain how the modern atomic theory contradicted Dalton’s atomic theory.
Write down the names of the particles represented by the following symbols and explain the meaning of superscript and subscript numbers attached.
`""_1"H"^1`, `""_0"n"^1`,`""_(-1)"e"^0`
