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Solutions of Periodic Classification Of Elements (Page No - 302) - Chemistry Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10 PDF Download

Question 1:
Given alongside is a part of the periodic table :
 As we move horizontally from left to right :
 (i) What happens to the metallic character of the elements ?
 (ii) What happens to the atomic size ?
lakhmir-singh-chemistry-class-10-solutions-periodic-classification-of-elements-302(1)
 Solution :

(i) Metallic character decreases.
(ii) Atomic size decreases .

Question 2:
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table ?
 Solution :

On moving from left to right in a period, the tendency of atoms to gain electrons increases.

Question 3:
 How would the tendency to lose electrons change as we go from left to right across a period of the periodic table ?
 Solution :

On moving from left to right in a period, the tendency of atoms to lose electrons decreases

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FAQs on Solutions of Periodic Classification Of Elements (Page No - 302) - Chemistry Lakhmir Singh, Class 10 - Extra Documents, Videos & Tests for Class 10

1. What is the periodic classification of elements?
Ans. The periodic classification of elements is a method of organizing the elements based on their similar properties and increasing atomic number. It arranges the elements into periods (rows) and groups (columns) on the periodic table.
2. How many periods and groups are there in the periodic table?
Ans. The periodic table consists of 7 periods (rows) and 18 groups (columns). Each period represents the energy levels or shells occupied by the electrons, while each group represents the number of valence electrons.
3. What is the significance of periodic classification in chemistry?
Ans. The periodic classification of elements is significant in chemistry as it helps in predicting the properties of elements based on their position in the periodic table. It also provides a systematic arrangement for studying and understanding the behavior and trends of elements.
4. How are elements arranged within a group in the periodic table?
Ans. Elements within a group in the periodic table are arranged in order of increasing atomic number. They have similar chemical properties and the same number of valence electrons, which determines their reactivity and bonding behavior.
5. What are the main trends observed in the periodic table?
Ans. The main trends observed in the periodic table include the increase in atomic number and atomic mass from left to right across a period. Within a group, the atomic size increases from top to bottom, while the reactivity and metallic character increase from top to bottom and decrease from left to right. Additionally, the elements in the same group have similar chemical properties.
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