Class 8 General Science Notes: - Unit-5: The Periodic Table of Elements: Solved Exercise (Short Questions and Answers)

(National Book Foundation - New Book/New Syllabus Based on National Curriculum Pakistan 2023-2024 and Onwards)

(Class 8 General Science Notes for 8th Centralized Exam 2023-2024 and onward, FDE, Islamabad)

B. Short questions 

i). Write common names for groups of normal elements.

Ans: Common names for groups of the normal element.  Group IA: the Alkali Metals (except Hydrogen) Group IIA: the Alkaline Earth Metals Group VIIA: the Halogens  Group 0 or VIIIA: the Noble Gases ii). Suggest why copper and aluminum are used in electricity cables? Ans: Copper and Aluminum are good conductors of electricity. It is therefore used in electrical cables. iii). Many pots and pans are made up of steel instead of pure iron. Why? Ans: Steel is a good thermal conductor. It has a higher melting point. Steel is used to make Kettles, pots, and Frying pans to withstand high temperatures during cooking. iv). Write three properties that make gold suitable for making jewelry. Ans: Gold and Silver are soft and can be shaped into rings, bangles, and necklaces easily. Their shiny appearance makes jewelry very attractive.  v). In which portion of the periodic table metals and non-metals are present? Ans: Metals: Metal appears on the left-hand side of the periodic table. Non-Metals: Non – Metals are present on the right-hand side of the periodic table. vi). Metals wires can be transformed into different shapes without breaking why? Ans: Metals wires can be transformed into different shapes without breaking. Because metals are flexible and bend into different shapes easily. vii). Why electrical cables are covered with plastics? Electric cables are covered with plastic as it is non-metal. Non-metals are poor conductors of electricity except graphite. So plastic does not allow electricity to pass through them.

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Unit-5: The Periodic Table of Elements: Solved Long Questions and Answers

Class 8 General Science Notes

Source: General Science Book (National Book Foundation, Pakistan)

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