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प्रश्न
The atoms of which of the following pair of elements are most likely to exist in free state ?
विकल्प
hydrogen and helium
argon and carbon
neon and nitrogen
helium and neon
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उत्तर
helium and neon
Atoms of helium and neon exist in a free state because they are inert gases and chemically inactive.
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संबंधित प्रश्न
What is meant by atomicity? Name the diatomic element.
How are the elements with variable valency named? Explain with an example.
Give two examples of the following:
Liquid + Liquid mixture:
Explain the terms ‘chemical formula’.
Write the radical of the following valency:
Hydroxide
Write the radical of the following valency:
Potassium
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Lead
write symbol with the variable valency
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Dichromate
What does the symbol '(l)' present in a chemical equation, mean?
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
