There are ______ number of known elements.

रिक्त स्थान भरें

There are 118 number of known elements.

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अध्याय 3: Matter Around Us - Evaluation [पृष्ठ ३८]

अध्याय 3 Matter Around Us
Evaluation | Q II. 6. | पृष्ठ ३८

Tick the most appropriate answer

Solutions are

Write true or false

All pure substances have characteristic melting and boiling points.

Give one example for the following types of mixtures :

misicible liquids

Give two examples of Metalloids.

Give two examples of Noble gases.

Give two examples of the following.
Inert gases

State the number of atoms of C₆H₁₂O₆

Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of

State what are radicals. Give the names of the radicals –

(a) NO₃
(b) OH
(c) SO₄
(d) CO₃

Give three differences between elements & compounds with relevant examples.