Classification of Elements- The Periodic Table — Important Questions
Telangana Board · Class 10 · Physical Sciences
44 important questions from Classification of Elements- The Periodic Table for Telangana Board Class 10 Physical Sciences, with answers.
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Important Questions from Classification of Elements- The Periodic Table
How many groups are there in the modern periodic table?
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18
The modern periodic table has 18 vertical columns called groups, numbered from 1 to 18 according to IUPAC recommendations.
Which of the following are alkali metals?
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Lithium, Sodium, Potassium
Alkali metals belong to Group 1 (IA) and include lithium, sodium, potassium, rubidium, cesium, and francium. Magnesium and calcium are alkaline earth metals (Group 2).
Which of the following are halogens?
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Fluorine, Chlorine, Bromine, Iodine
Halogens belong to Group 17 (VIIA) and include fluorine, chlorine, bromine, iodine, and astatine. Oxygen belongs to Group 16.
The number of periods in the modern periodic table is:
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7
The modern periodic table has 7 horizontal rows called periods, representing the number of electron shells in atoms.
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