FAQs on Periodic Classification of Elements : CBSE Class 10 X Science (Chemistry)

Question 1

1. What is the periodic classification of elements?

Accepted Answer

Ans. The periodic classification of elements refers to the arrangement of elements based on their properties and atomic numbers in a periodic table. It helps in organizing and studying the various elements in a systematic manner.

Question 2

2. How many periods are there in the periodic table?

Accepted Answer

Ans. There are a total of seven periods in the periodic table. Each period represents a horizontal row in the table and corresponds to the number of energy shells or electron orbits present in the elements of that period.

Question 3

3. What is the significance of the groups in the periodic table?

Accepted Answer

Ans. The groups or columns in the periodic table are significant as they represent elements with similar chemical properties. Elements in the same group have the same number of valence electrons, which determine their reactivity and bonding patterns.

Question 4

4. Why are noble gases placed in a separate group?

Accepted Answer

Ans. Noble gases, such as helium, neon, and argon, are placed in a separate group (group 18) in the periodic table because they have a completely filled outermost electron shell. This makes them highly stable and less reactive compared to other elements.

Question 5

5. How does the atomic size change as we move across a period in the periodic table?

Accepted Answer

Ans. As we move across a period in the periodic table from left to right, the atomic size decreases. This is because the number of protons and electrons increases, resulting in a stronger attraction between the positively charged nucleus and the negatively charged electrons. This increased attraction pulls the electrons closer to the nucleus, making the atomic size smaller.

Periodic Classification of Elements CBSE Class 10 X Science (Chemistry)

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