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प्रश्न
Name the scientist who prepared modern periodic table.
उत्तर
Henry Moseley prepared the modern periodic table.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Give two example of group 17 elements.
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
Explain why All the elements of a group have similar chemical properties.
On the basis of electronic configuration, how will you identify the first element of a period?
What is the number of elements in the 3rd period, of the modern periodic table?
Give the symbol and valency of the following element and radical.
Hydroxide
What are the periods in a periodic table?
To the left of the zig-zag line in the periodic table are the metal elements.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
