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प्रश्न
How were the positions of isotopes of an element decided in the modern periodic table?
उत्तर
The isotopes of elements are not given a separate place in the periodic table. This is because isotopes have the same atomic number and a different atomic mass, and the modern periodic table is based on the atomic number of elements. Hence, to give it a separate place, the elements should be arranged according to their atomic mass.
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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−
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
Name the scientist who stated the modern periodic law.
Name two elements in halogens.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Ammonium
Give the chemical formula of sodium bicarbonate
Distinguish between:
s-block - p-block
Match the atomic number with the following:
An element of group 2.
