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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.
APPEARS IN
संबंधित प्रश्न
Write true or false for the following statement
The maximum number of electrons in the first shell can be 8.
Give the following a suitable word/phrase.
Protons and neutrons present in the nucleus.
Give the following a suitable word/phrase.
The smallest unit of an element which takes part in a chemical reaction.
What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?
Explain the rule with example according to which electrons are filled in various energy levels
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.
ANSWER IN DETAIL
Name the three subatomic particles. How are they different from each other ?
ANSWER IN DETAIL
Write a note on valence shell.
Compare a proton and a neutron in respect of mass and charge.
Select the correct answer from the choice in the bracket to complete the sentence:
An element ‘X’ has six electrons in its outer or valence shell. Its valency is __________.
