Give formula of (i) Gallium oxide (ii) Gallium chloride.

Important Questions on Periodic Classification of Elements

EASY

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 5

Which of $\mathrm{Li}, \mathrm{Na}, \mathrm{K}, \mathrm{Rb}, \mathrm{Cs}$ will react vigorously with ${\mathrm{H}}_2\mathrm{O}$ and why?

EASY

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 6

Which of the element is most metallic in group I and why?

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 7

Which of the element is most non-metallic in group 16 and why?

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 8

In its modified form_____is an organisation of all the known elements, arranged in order of increasing_____of the element lie in the same_____have similar_____, have the same number of_____. The table is particularly useful for predicting the outcome of chemical reactions between_____since an atom of any element tends to react so as to convert its electronic structure to that of a nearby_____.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 9

Looking at the resemblance to alkali metals and the halogen family, try to assign hydrogen a correct position in Mendeleev's periodic table. To which group and period hydrogen can be assigned.

EASY

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 10

Name the first 3 elements of first group of modern periodic table. Write their electronic configuration.

HARD

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 11

Describe the achievements of Mendeleev's periodic table.

MEDIUM

10th CBSE

IMPORTANT

SCIENCE CHEMISTRY Part-II>Chapter 5 - Periodic Classification of Elements>Summative Assessment>Q 12

What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which passed a challenge to Mendeleev's periodic law.