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Chemistry - Periodic Classification Of Elements

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16. False statement for second period elements is (NTSE Rajasthan, Stage-I, 2013-14)

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17. Which of the following is the correct electronic configuration of Argon? (NTSE Rajasthan, Stage-I, 2013-14)

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18. Match the following
Column-I Column-II
(A) Strongest reducingagent in aqueoussolution (i) Thalium
(B) Shows inert pair effect (ii) Caesium
(C) Forms peroxide on heating with excess of oxygen (iii) Lithium
(D) Used in photo cells (iv) Sodium (NTSE Haryana, Stage-I, 2013-14)

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19. The atomic number of third alkali metal is (NTSE Odisha, Stage-I, 2013-14)

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20. An element X has 7 electrons in its L shell. What is true about the element X___________________ ?
I. It belongs to period 9 of modern periodic table.
II. Its atom contains 9 protons.
III. It has a valency of 7. IV. Its atoms can accept an electron to acquire noble gas configuration (NTSE Stage-II, 2012-13)

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Periodic Classification Of Elements