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प्रश्न
Write the electronic configuration of the first two alkaline earth metals.
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उत्तर
Electronic configuration of the first two alkaline earth metals:
4Be: 1s22s2
12Mg: 1s22s22p63s2
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संबंधित प्रश्न
What is meant in the periodic table by a group?
Name two elements of each group.
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
Name the alkali metals, How many electron(s) they have in their outermost orbit.
How many electrons do inert gases have in their valence shells?
Write a short note on the following type of element –
noble gases
‘The periodic table contains elements methodically grouped together’.
State the main helpful features of the long form of the periodic table.
Give a reason for the following:
Group 1 [I – A] elements are called alkali metals.
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 |
