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प्रश्न
State the main helpful features of the long form of the periodic table.
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उत्तर
Long-form of the periodic table has 7 periods horizontal rows and 18 groups vertical columns and properties show regular gradations in periods and also in groups, i.e.
| Electronegativity | → | Increases in a period |
| ↓ | decreases in a group | |
| Non-metallic character | → | Increases in a period |
| ↓ | decreases in a group | |
| Size of an atom | → | decreases in a period |
| ↓ | Increases in a group |
and so on.
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संबंधित प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas with duplet arrangement of electrons.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas having electronic configuration: 2, 8, 8.
Name the method by which alkali metals can be extracted.
How do alkaline earth metals occur in nature?
Name the gas used in:
Filling balloons
Give reason:
Alkali metals are kept in an inert solvent.
Give reason:
Alkali metals and halogens do not occur free in nature.
State the characteristics which remain similar in moving down in a group of the periodic table.
Select the correct answer from the options given below.
The most reactive halogen from group 17.
State the following:
The group whose elements are unreactive or inert.
