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प्रश्न
Distinguish between:
Group 17 - Group 18
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उत्तर
| Group 17 | Group 18 | |
| 1. | Elements of group 17 are called halogens. | Elements of group 18 are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons except helium which contains 2 electrons. |
| 3. | Their valency is 1. | Their valency is zero. |
| 4. | They form diatomic molecules with general formula (X2). | They are monoatomic gases under normal conditions. |
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संबंधित प्रश्न
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Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
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On the basis of electronic configuration, how will you identify chemically similar elements?
On the basis of electronic configuration, how will you identify the first element of a period?
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Name two elements in halogens.
Name two elements in Inert gas.
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Write a short note.
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Give the symbol and valency of the following element and radical.
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Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of carbonic acid
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Write scientific reason.
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Explain structure of modern periodic table in short.
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It has same valency as Lithium.
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State the group and period, of the element having three shells with three electrons in valence shell.
Name the non-metals in the first twenty elements.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Match the atomic number with the following:
An element of group 2.
Give reason for the following:
Inert gases do not form ion.
