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प्रश्न
Name or state following with reference to the element of the first three periods of the periodic table.
The non-metallic element present in period 3 other than sulphur and chlorine.
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उत्तर
P [Phosphorus]
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संबंधित प्रश्न
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.
An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:
(a) What is the number of valence electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.
In which part of a group would you separately expect the elements to have the largest atomic size?
Explain why, the properties of elements are repeated after 2, 8, 18 and 32 elements in the periodic table.
Which one of the following does not increase while moving down the group of the periodic table?
An element A has atomic number 14. To which period does this element belong and how many elements are there in this period.
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
Select the correct answer
Most reactive character among the elements given below is found in
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
Choose the correct answer from the choice given:
An element A belonging to Period 3 and Group II will have
