Which of the following has the least density?

(1)Na

(2)Li

(3)Mg

(4)K

Subtopic:  Modern Periodic Table & Periodicity |
 70%
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An element R forms the highest oxide R2O5. R belongs to:

(a) IV group

(b) V group

(c) VI group

(d) VII group

Subtopic:  Modern Periodic Table & Periodicity |
 76%
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Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

1. ns and np orbits

2. (n-1)d and ns orbits

3. (n-1)d orbits

4. ns orbits

 

Subtopic:  Modern Periodic Table & Periodicity |
 82%
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In the II period, the most acidic oxide is formed by:

1. F

2. N

3. O

4. Li

Subtopic:  Nature of Compound |
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The outer electronic configuration of Gd (Atomic no. 64) is:

(1) 4f3 5d56d2

(2) 4f8 5d106d2

(3) 4f4 5d46d2

(4) 4f7 5d16s2

Subtopic:  Atomic Size |
 81%
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Which of the following transition metal ions has the lowest density?

(a) Copper

(b) Nickel

(c) Scandium

(d) Zinc

Subtopic:  Modern Periodic Table & Periodicity |
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Ionic radii are :

(1) Inversely proportional to effective nuclear charge.

(2) Inversely proportional to square of effective nuclear charge.

(3) Directly proportional to effective nuclear charge.

(4) Directly proportional to square of effective nuclear charge.

Subtopic:  Atomic Size |
 76%
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Which one is a metalloid?

(1)Tin

(2)Germanium

(3)Sulphur

(4)Carbon

Subtopic:  Nature of Compound |
 85%
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Elements with electronic configuration 1s2,2s22p6, 3s23p63d10, 4s24p64d10, 5s25p3 belongs to the ...... group of periodic table.

1. 3rd

2. 15th

3. 17th

4. 12th

Subtopic:  Electronic Configuration |
 80%
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General electronic configuration of the transition elements is given by:

(1) ns2nd1-10

(2) ns2np6nd1-10

(3) (n-1)d1-10np6

(4) (n-1)d1-10ns1-2

 

Subtopic:  Electronic Configuration |
 87%
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