MEDIUM
10th Maharashtra Board
IMPORTANT
Earn 100

Give scientific reasons: 

Elements belonging to the same group have the same valency.  

Important Questions on Periodic Classification of Elements

MEDIUM
10th Maharashtra Board
IMPORTANT
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen. 
EASY
10th Maharashtra Board
IMPORTANT
The arrangement of elements in a group of three is known as _____.
MEDIUM
10th Maharashtra Board
IMPORTANT
Write the merits of the modern periodic table over Mendeleev's Periodic table. 
MEDIUM
10th Maharashtra Board
IMPORTANT

In Dobereiner's triads Li, Na, K, the atomic masses of lithium and potassium are 6.9 and 39.1 respectively, then what will be the atomic mass of sodium. 

MEDIUM
10th Maharashtra Board
IMPORTANT

Write merits of Mendeleev's periodic table. 

EASY
10th Maharashtra Board
IMPORTANT
According to Mendeleev's periodic law, properties of elements are periodic function of their _____
MEDIUM
10th Maharashtra Board
IMPORTANT

Give scientific reasons: 

Elements belonging to the same group have the same valency.