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प्रश्न
Name the type of elements which have outermost shell complete.
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उत्तर
Noble gases
संबंधित प्रश्न
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Fill in the following blank with suitable word:
Group 18 elements are called ...............
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
Define:
Periodic table
What is meant in the periodic table by a period?
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium nitrate
