Classification of Elements- The Periodic Table — Practice Quiz
Telangana Board · Class 10 · Physical Sciences
4 MCQs on Classification of Elements- The Periodic Table for Telangana Board Class 10 Physical Sciences: tap an answer to check it and see why.
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Who proposed the law of triads?
According to Dobereiner's law of triads, if lithium has atomic weight 7 and potassium has atomic weight 39, what should be the atomic weight of sodium?
Newlands arranged elements in groups of how many?
The modern periodic law states that properties of elements are periodic functions of their:
Sample Questions
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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