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प्रश्न
An element A has 2 electrons in its fourth shell. State:
position in the periodic table
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उत्तर
Position in the periodic table is group 2 period 4
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संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
Calcium is an element with atomic number 20. Stating reason, answer each of the following questions:-
(i) Is calcium a metal or a non-metal?
(ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19?
(iii) Write the formula of its oxide.
Write the atomic numbers of two elements 'X' and 'Y' having electronic configuration 2, 8, 2 and 2, 8, 6 respectively.
How does Chemical reactivity of elements change on going from left to right in a period of the periodic table?
Give example in support of your answer.
For each of the following triads, name the element with the characteristics specified below:
| Elements | Least atomic radius | Chemically least reactive |
| (i) F, Cl, Br (ii) Li, Na, K |
.................... .................... |
.................... .................... |
How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way?
Periodicity is observed due to the similar ______.
What is meant by periodicity of elements?
State the number of elements in period 1, period 2 and period 3 of the periodic table.
The similarities in the properties of a group of elements are because they have the same ______.
