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प्रश्न
In the classification of the them known elements, Mendeleev was guided by two factors. What are those two factors?
उत्तर
In the classification of the then known elements, Mendeleev was guided by two factors, which are:
1. Increasing atomic masses
2.Grouping together of elements having the same properties
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संबंधित प्रश्न
What were the criteria used by Mendeleev in creating his Periodic Table?
What property do all elements in the same column of the Periodic Table as fluorine have in common?
What was the Mendeleev's basis for the classification of elements?
Which group of elements could be placed in Mendeleev's periodic table later on, without disturbing the order? Give reason.
What name were given by Mendeleev to the then undiscovered element germanium?
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
Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______
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.
Match the column:
| Column ‘A’ | Column ‘B’ |
| Alkali metals | (a) Group 18 |
| Halogens | (b) Group 1 |
| Noble gases | (c) Group 17 |
