There are ______ number of known elements.

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There are 118 number of known elements.

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Chapter 3 Matter Around Us
Evaluation | Q II. 6. | Page 38

Tick the most appropriate answer

Solutions are

Write the Chemical Name of the Following and Also Give Their Molecular Formulae:

Sand

Give two examples of Metalloids.

Give three differences between metals and non-metals.

Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements

Tick (√) the correct alternative from the choice given for the following statement

The hardest naturally occurring substance

Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.

Write the names of elements from the following symbol:

Xe

______ is the life-giving element is the air.

Name the two elements which are derived from the country.