The Periodic Table — Important Questions
ICSE · Class 9 · Chemistry
44 important questions from The Periodic Table for ICSE Class 9 Chemistry, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from The Periodic Table
Which of the following are defects of Mendeleev's periodic table?
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Position of isotopes, Anomalous pairs, Position of hydrogen
The main defects were: isotopes should have different positions due to different masses, some elements were placed incorrectly (like Ar before K), and hydrogen's position was unclear. Prediction of elements and grouping were actually merits.
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 are Group 1 elements: Li, Na, K, Rb, Cs, and Fr. They have one electron in their outermost shell. Mg and Ca are alkaline earth metals (Group 2).
The valency of Group 17 elements is:
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1
Group 17 elements (halogens) have 7 electrons in their outermost shell, so they need 1 more electron to complete their octet. Therefore, their valency is 1.
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