Those in a group that falls under the law of triads include:

1. Cl, Br, I

2. C, N, O

3. Na, K, Rb

4. H, O, N

Subtopic:   Evolution of Periodic Table |
 63%
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 All the non-metals in the long form of the periodic table are placed under:

1. s-Block

2. p-Block

3. f-Block

4. d-Block

Subtopic:  Modern Periodic Table & Periodicity |
 88%
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The statement that is incorrect for the periodic classification of elements is:

1. The properties of elements are a periodic function of their atomic number.

2. Non-metallic elements are lesser in number than metallic elements.

3. The first ionization energies of elements along a period do not vary in a regular manner with an increase in atomic number.

4. For transition elements, the d-subshells are filled with electrons monotonically with an increase in atomic number.

Subtopic:  Electronic Configuration |
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Which among the following options is a nonmetal?

1. Gold 2. Mercury
3. Scandium 4. Selenium
Subtopic:  Modern Periodic Table & Periodicity |
 74%
From NCERT
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An example of metalloid elements in the periodic table is:

1. Na and K 2. Cu and Al
3. As and Si 4. Ca and Mg
Subtopic:  Modern Periodic Table & Periodicity |
 88%
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Which among the following elements is the bridge element?

1. K

2. O

3. Mg

4. Pb

Subtopic:  Modern Periodic Table & Periodicity |
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Sodium generally does not show an oxidation state of +2, because of:

1. High first ionization potential.

2. High second ionization potential.

3. Large ionic radius.

4. High electronegativity.

Subtopic:  Electronic Configuration |
 78%
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The electronegativity of the following elements increases in the order of:

1. S < P < N < O 2. P < S < N < O
3. N < O < P < S 4. N < P < S < O
Subtopic:  Electronegativity |
 71%
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Elements with an electronic configuration 1s2s22p 3s23p63d10 4s24p64d10 5s25p3 belong to the group :

1. 3rd 2. 15th
3. 17th 4. 2nd
Subtopic:  Electronic Configuration |
 82%
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Element that has the greatest tendency to lose an electron is :

1. F 2. Fr
3. S 4. Be
Subtopic:  Ionization Energy (IE) |
 62%
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