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प्रश्न
Define the term Mass number.
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उत्तर
Mass number refers to the sum of the number of protons and neutrons present in the nucleus of an atom and denoted by A Mass number = Number of protons + Number of neutrons.
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संबंधित प्रश्न
Give the following a suitable word/phrase.
The sum of the number of protons and neutrons of an atom.
Define the term Atomic number.
Mention briefly the salient features of Dalton’s atomic theory (five points)
FILL IN THE BLANK
The electrons revolving in shells close to the nucleus are called ................... electrons.
FILL IN THE BLANK
In an atom, the last shell containing electrons is called its..................shell.
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 is an atom?
WRITE SHORT ANSWER
What do you mean by electron transition?
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
If an atom ‘A’ has an atomic number of eleven, state the number of protons and electrons it contains.
