Name two elements which shows variable valencies.

Important Questions on Periodic Classification of Elements

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 1>Q 41

Name one element having $18$ electrons in its outermost shell. (Sodium / Carbon / Palladium)

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 1>Q 42

In which ionic compound, the ratio of cation to anion is the greatest? (Caesium iodide / Caesium Fluoride)

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 1>Q 43

Name the heaviest gaseous non-metal. (Oxygen/ Carbon dioxide/ Radon)

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 1>Q 44

Name the element with electronegativity next to fluorine. (Nitrogen / Oxygen / Bromine)

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 1>Q 45

Name the elements showing maximum covalence.

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 3>Q 1

Give a brief account of the historical developments for the classification of elements.

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 3>Q 2

What is Dobereiner's triads? Explain with examples.

MEDIUM

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 3>Q 3

What is Newland's law of octaves? Why was this law rejected?