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प्रश्न
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 __________.
विकल्प
+2
−2
−1
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उत्तर
An element ‘X has six electrons in its outer or valence shell. Its valency is −2.
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संबंधित प्रश्न
Give the following a suitable word/phrase
The sub-atomic particle with negative charge and negligible mass.
Give the following a suitable word/phrase
Arrangement of electrons in the shells of an atom.
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
Mention briefly the salient features of Dalton’s atomic theory (five points)
WRITE SHORT ANSWER
Describe a discharge tube.
Compare an electron and a proton in respect of mass and charge.
Name the sub-atomic particle whose charge is 0.
Explain in brief – Goldstein’s experiment which led to the discovery of the proton.
Select the correct answer from the choice in the bracket to complete the sentence:
Magnesium atom with electronic configuration 2, 8, 2 achieves stable electronic configuration by losing two electrons, thereby achieving stable electronic configuration of the nearest noble gas _______.
