Find out the valencies of the first twenty elements.

Important Questions on Periodic Classification of Elements

HARD

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>Activity 1.3

Find out how does the valency vary in a period of going from left to right?

HARD

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 1

What names have been given to the horizontal arrangement of elements in the periodic table? Is there any gradation in the properties of elements across these rows? Give two examples to illustrate.

MEDIUM

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 3

From the standpoint of the atomic structure, what determines which element will be the first and which will be the last in a period of the periodic table?

HARD

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 4

Accommodation of isotopic form of the same element was an upset in Mendeleev's periodic table. How could the Modern periodic table remove the anomaly?

MEDIUM

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>Let us answer these>Q 5

Name two elements you would expect to show chemical reactions similar to lithium. What is the basis of your choice?

MEDIUM

10th Manipur Board

IMPORTANT

Science for Class 10>Chapter 1 - Periodic Classification of Elements>EXERCISES>Q 1

Why is there a need to classify the elements? What difficulties are likely to arise if the classification is not made?

EASY

10th Manipur Board