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Question
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.
Solution
Element is Helium
RELATED QUESTIONS
Name two elements of each group.
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
How many electrons do inert gases have in their valence shells?
Name the gas used in:
Light bulbs
Write a short note on the following type of element –
halogens
‘The periodic table contains elements methodically grouped together’.
State the main helpful features of the long form of the periodic table.
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.
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 |
