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प्रश्न
Why do you think the noble gases are placed in a separate group?
उत्तर
Noble gases are inert elements. Their properties are different from the all other elements. Therefore, the noble gases are placed in a separate group.
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संबंधित प्रश्न
What property do all elements in the same column of the Periodic Table as fluorine have in common?
In Mendeleev's periodic table, why was there no mention of noble gases like helium, neon and argon?
In Mendeleev's periodic table, gaps were left for the elements to be discovered later on. An element which found a vacant place in the periodic table later on is:
(a) Be
(b) Si
(c) Ge
(d) Se
An element X forms an oxide X2O3. In which group of Mendeleev's periodic table is this element placed?
(a) group II
(b) group III
(c) group V
(d) group VIII
Eka boron : Scandium : : Eka Aluminum : _______
Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______
Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
Write the name.
The family of elements having zero valency.
Write scientific reason.
In a group, the size of the atom increases as it goes down from the top.
