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प्रश्न
Define:- Periodic table
उत्तर
Periodic table:- represents the tabular arrangment of elements in horizontal rows called periods and vertical columns called groups in order to classify the elements and their systematic study.
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संबंधित प्रश्न
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
State how the valency of elements varies in a group of the periodic table?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
Write a short note.
Structure of the modern periodic table.
Give the symbol and valency of the following element and radical.
Calcium
What are the elements.
The modern periodic table has 1 to 7 periods.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
Name the non-metals in the first twenty elements.
