Question

C. Short answer questions.
1. What is an element?
2. What do you understand by valency of an element?
3. Name any two elements that have variable valencies.
4. Give three characteristics of a mixture.
5. What is a homogeneous mixture? Give an example.
6. State the principle of the working of a separating funnel and fractional distillation.
7. List the uses of paper chromatography.
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Answer 1

Answer:

Your answers

• An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number.

Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions. Elements can only be changed into other elements using nuclear methods.

• In chemistry, the valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence was developed in the second half of the 19th century and helped successfully explain the molecular structure of inorganic and organic compounds.

Answer 2

Answer:

1 when 2 or more atoms of the same kind react with each other they are called element for example: O2

2. The no. of electrons an atom should give or take to get 8 or maximum no. Of electrons in the outer shell is called the atom's valency

3. Iron,phosphorous

Explanation: