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प्रश्न
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
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उत्तर
In period 1 the number of electron shells is [1] In period 2 is [2], in period 3 is [3]
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संबंधित प्रश्न
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
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.
Name the non-metals present in period 2 and metals in period 3.
Name the element in period 3 which does not form oxide.
State the number of elements in period 1, period 2 and period 3 of the periodic table.
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
Arrange the following as per instruction given in the bracket.
Li, K, Na, H ( decreasing order of their potential ionisation )
Arrange the following in order of increasing radii:
N, O, P
An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?
The electronic configuration of an element is 2, 8, 4. State it:
name and write its one physical property.
