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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
Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.
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 first three alkaline earth metals.
Write the electronic configuration of the first two alkaline earth metals.
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Write a short note on the following type of element –
alkaline earth metals
Write a short note on the following type of element –
halogens
‘The periodic table contains elements methodically grouped together’.
Name or state following with reference to the element of the first three periods of the periodic table.
An alkaline earth metal in period 3.
State the following:
The group whose elements are unreactive or inert.
