EASY
10th CBSE
IMPORTANT
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Two elements A and B belong to the same period. What is common in them? (Electron shells / Number of valence electrons)

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Important Questions on Periodic Classification of Elements

MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 6
The electronic configuration of an element is 2,8,6. Identify the element and name of the family to which it belongs.
EASY
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 7
How would tendency to gain electrons change as you go down a group?
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 8
Why do elements present in a group show similar characteristics after definite gaps of atomic numbers 8,8,18,18,18,32?
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 9
Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 10
The electronic configuration of an element 'X' is 2, 8, 8, 2. To which period and group of the periodic table does the element 'X' belong? State its valency. Justify your answer in each case.
EASY
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 11
Write the number of vertical columns in the modern periodic table. What are these columns called?
EASY
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 12
Why are elements H, Li, Na and  K placed in group 1?
MEDIUM
10th CBSE
IMPORTANT
SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 13
Metals are known as electropositive elements while non-metals electronegative elements. Assign reason.