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#2 | Predicting Group & Block No. of Elements
(Chemistry) > Classification of Elements and Periodicity in Properties

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Element 58Ce belongs to:

1. s-block elements

2. p-block elements

3. d-block elements

4. f-block elements

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General electronic configuration of outermost and penultimate shell of an atom is
(- 1)s2 (n - 1) p6 (- 1)dx ns2. If n = 4 and x = 5, the number of proton in the nucleus is:

1. > 25

2. < 24

3. 25

4. 30

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The maximum number of valence electrons possible for atoms in the second period of the periodic table is:

1. 18

2. 10

3. 8

4. 2

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The element having atomic number 19, is:

1. an inert gas

2. a metal with oxidation number +1

3. a non-metal with oxidation number -3

4. a metal with oxidation number -3

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An element having the electronic configuration of its atom ns2 np2 should have similar properties to those of:

1. Sodium

2. Carbon

3. Magnesium

4. Oxygen

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