Given below are the atomic radii of some elements of second period. Element B O N C Atomic Radius in pm 88 66 74 77 Arrange these elements in the increasing order of their atomic numbers. Give reason for your answer.

Arrangement of elements in the increasing order of their atomic number is B < C < N < O . With increase in atomic number across the period the atomic radius decreases as nuclear charge increases. The increase in nuclear charge attracts the electrons more strongly pulling them closer to the nucleus.

MEDIUM

10th CBSE

IMPORTANT

Earn 100

The electronic configuration of an element is $2, 8, 5$ . To which group and period does it belong?

Important Questions on Periodic Classification of Elements

HARD

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 16

In the modern periodic table, the element calcium (atomic number =

20

) is surrounded by elements with atomic number

12, 19, 21 & 38

. Which of these elements has physical and chemical properties resembling those of calcium and why?

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 17

Explain the variation in the following property of the elements in the periodic table.

Atomic radius in a period.

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 17

Explain the variation in the following property of the elements in the periodic table.

Metallic character in a period.

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 17

Explain the variation in the following property of the elements in the periodic table.

Valency in a group.

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 18

Na, Mg

and

Al

are the elements having one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each.

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 19

Given below are the atomic radii of some elements of second period.

Element	B	O	N	C
Atomic Radius in pm	88	66	74	77

Arrange these elements in the increasing order of their atomic numbers. Give reason for your answer.

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 20

The elements $Li, Na$ and $K$ each having one valence electron, are in period $2, 3$ and $4$ respectively of modern periodic table.

In which group of the periodic table should they be? Give reason to justify your answer.

MEDIUM

10th CBSE

IMPORTANT

SUPER SIMPLIFIED SCIENCE CHEMISTRY CLASS X>Chapter 5 - Periodic Classification of Elements>Test Your Knowledge>Q 20

The elements $Li, Na$ and $K$ each having one valence electron, are in period $2, 3$ and $4$ respectively of modern periodic table.

Which one of them is least reactive? Give reason to justify your answer.

The electronic configuration of an element is 2, 8, 5. To which group and period does it belong?

Important Questions on Periodic Classification of Elements

Learn and Prepare for any exam you want !

The electronic configuration of an element is $2, 8, 5$ . To which group and period does it belong?