What is the atomic radius of a hydrogen atom?

Important Questions on Periodic Classification of Elements

MEDIUM

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 35

Name two elements, other than Gallium, whose existence was predicted by Mendeleev.

EASY

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 36

The Eka-Silicon predicted by Mendeleev was later replaced by which element ?

MEDIUM

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 37

Write the names of the elements in the $3$rd period which have the largest and the smallest atom.

EASY

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 38

Name the inert gas which has two electrons in its valence shell. 

MEDIUM

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 39

How does valency vary in going down a group? 

MEDIUM

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 40

How does the electropositive character of elements vary along a period of the Periodic Table? 

MEDIUM

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 41

Metals have a tendency to form cations. Give reason. 

EASY

10th ICSE

IMPORTANT

Science Chemistry>Chapter 5 - Periodic Classification of Elements>ASSESSTMENT>Q 42

How does the electronegative character of elements vary along a period of the Periodic Table?