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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 symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
Give the symbol of the following element:
Carbon
Give the symbol of the following element:
Zinc
Give the symbol of the following element:
Radon
State the type of element for the following:
Iodine
State the type of element for the following:
Bromine
Write the radical of the following valency:
Chlorine [Chloride]
Write the radical of the following valency:
Sulphate
Give the formula of the following gas:
Carbon monoxide
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Copper
write symbol with the variable valency
