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प्रश्न
Compare Modern Periodic Law with Mendeleev's Periodic Law.
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उत्तर
Modern Periodic Law:
- Basis is “properties of elements depend on electronic configuration.” Elements are arranged in increasing atomic number.
Mendeleev's Periodic Law:
- Basis is “properties of elements are a periodic function of atomic mass.”
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संबंधित प्रश्न
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Name two elements in each case:
Transition element
What is meant in the periodic table by a period?
Give the symbol and valency of the following element and radical.
Magnesium
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
______ and ______ are called inner transition elements.
The inert gas which lies in the third period is ______
An element which is an essential constituent of all organic compounds belongs to
