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प्रश्न
How many periods and groups are there in the modern periodic table?
उत्तर
Eighteen groups and seven periods
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Define:- Periodic table
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
What is the number of elements in the 3rd period, of the modern periodic table?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium nitrate
Explain the position of hydrogen in the periodic table.
