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प्रश्न
What is variable valency? Name two elements having variable valency and state their valencies.
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उत्तर
Variable valency: Some elements exhibit more than one valency. They are said to have variable valency, e.g. Iron, copper, tin, lead.
Iron Fe Fe2+ or Fe3+
Copper cu cu+ or cu2+
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संबंधित प्रश्न
Write true or false for the following statement
An atom on the whole has a positive charge.
Multiple Choice Questions
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Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
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- Mass number = number of protons + number of neutrons
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- Atomic number = number of protons = number of electrons
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