Fill in the blanks
1. Pb is the symbol of __ element.

2. Neon and argon have valency.

3. The substances formed as a result of chemical reaction are caled .

4. A reaction in which an element breaks up to form two or more subsances is called .

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Solution

1. Pb is the symbol of Lead element.

2. Neon and argon have Zero valency.

3. The substances formed as a result of chemical reaction are called Products.

4. A reaction in which an element breaks up to form two or more substance is called Decomposition reaction.

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