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प्रश्न
How many groups and periods does the modern periodic table have?
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उत्तर
The modern periodic table consists of seven horizontal rows and eighteen vertical columns.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
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Define:
Periodic table
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name the noble gas with 3 shells.
Give the symbol and valency of the following element and radical.
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Give the symbol and valency of the following element and radical.
Sulphate
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