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प्रश्न
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
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उत्तर
The size of atoms decreases when moving from left to right in a period. Thus, in a particular period, the alkali metal atoms are the largest and the halogen atoms are the smallest.
Li > Be > B > C > N > O > F
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संबंधित प्रश्न
Name two elements of each group.
Name the first three alkaline earth metals.
Write the reactions of the first three alkaline earth metals with dilute hydrochloric acid.
How many electrons do inert gases have in their valence shells?
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Write a short note on the following type of element –
alkali metals
Write a short note on the following type of element –
noble gases
State the main helpful features of the long form of the periodic table.
State the following:
The group which contains highly reactive electronegative non-metals including chlorine.
Match the elements of List – I with their type from List – II.
| List – I | List – II |
| 1. Highly reactive, univalent metals | A: Halogens |
| 2. Highly reactive, univalent non-metals | B: Transition elements |
| 3. Unreactive, inert elements | C: Alkali metals |
| 4. Elements of group 3 to 12 [IB to VII B and VIII] | D: Lanthanide series |
| 5. Radioactive elements | E: Noble gases |
| F: Actinide series |
