EASY
10th ICSE
IMPORTANT
Earn 100

What are horizontal rows and vertical columns in Mendeleev’s periodic table known as?

Important Questions on Periodic Properties and Their Variations

EASY
10th ICSE
IMPORTANT
How modern periodic law was different from earlier periodic laws?
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10th ICSE
IMPORTANT
Which elements are known as representative elements?
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10th ICSE
IMPORTANT
What is the position of rare earth metals in periodic table?
EASY
10th ICSE
IMPORTANT
Write the electronic configuration of sodium.
EASY
10th ICSE
IMPORTANT
How change in valency affects the chemical properties?
EASY
10th ICSE
IMPORTANT
Why noble gases usually do not react? Explain with the help of electronic configuration.