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प्रश्न
What are groups and periods in the modern periodic table?
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उत्तर
- The horizontal rows are called periods. There are seven periods in the periodic table.
- Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the periodic table.
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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 period of the periodic table?
Correct the statement.
Copper and zinc are representative elements.
How does the electronic configuration of an atom relate to its position in the modern periodic table?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Bisulphite
Give the chemical formula of sodium sulphite
Noble gases are placed in the ______ group in the modern periodic table.
