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प्रश्न
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
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उत्तर
For arranging all the elements in a systematic and simple manner. The arrangement of elements was done in the form of a table called Periodic Table in which elements are arranged in increasing order of their atomic numbers. Elements in the Periodic Table are arranged in Horizontal rows called Periods and vertical columns called groups. Metallic elements are placed on the left non-metallic on the right and noble gases on the extreme right of the Periodic table.
संबंधित प्रश्न
The atomic number of an element X is 13. What will be the number of electrons in its ion X3+ ?
Out of ozone, phosphorus, sulphur and krypton, the elements having the lowest and highest atomicities are respectively :
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Copper by ‘Cu’
Match the symbols of metallic elements – with their correct combining power or capacity.
(a) K
(b) Zn
(c) Al
(d) Na
(e) Ca
Combining power or capacity – A : 3 ; B : 2 ; C : 1. (positive valencies)
State the type of element for the following:
potassium
State the type of element for the following:
Iodine
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Permanganate
______ of some elements are derived from Latin or Greek names of the elements.
Write the symbols for the following elements and classify them as solid, liquid and gas. Aluminum, Carbon, Chlorine, Mercury, Hydrogen and Helium
What is the significance of the symbol of an element?
