The total number of neutrons in dipositive zinc ions with mass number 70 is -

1. 34

2. 40

3. 36

4. 38

Subtopic:  Number of Electron, Proton & Neutron |
 74%
From NCERT
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An atom forms an ion by losing three electrons. The ion has an electronic configuration [Ar]3d6. The symbol of the ion is :

1. Fe3+ 2. Ni3+
3. Co3+ 4. Mn+3
Subtopic:  Number of Electron, Proton & Neutron |
 69%
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The number of electrons in one molecule of CO2 are - 

1. 22

2. 44

3. 66

4. 88

Subtopic:  Number of Electron, Proton & Neutron |
 73%
From NCERT
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The ion that is isoelectronic with CO is-

1. CN-

2. O2+

3. O2-

4. N2+

Subtopic:  Number of Electron, Proton & Neutron |
 85%
From NCERT
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The number of electrons in the valence shell of calcium is 

1. 6

2. 8

3. 2

4. 4

Subtopic:  Number of Electron, Proton & Neutron |
 83%
From NCERT
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Which of the following has the maximum number of  unpaired electons-

1. Mg2+

2. Ti3+

3. V3+

4. Fe2+

Subtopic:  Number of Electron, Proton & Neutron |
 72%
From NCERT
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The number of d- electrons retained in Fe2+ :

1. 5

2. 6

3. 3  

4. 4

Subtopic:  Number of Electron, Proton & Neutron |
 70%
From NCERT
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An isotone of 32Ge76 is:

(i) 32Ge77 

(ii) 33As77 

(iii) 34Se77 

(iv) 34Se78 

1. only (i) & (ii)

2. only (ii) & (iii)

3. only (ii) & (iv)

4. (ii) (iii) & (iv)

Subtopic:  Number of Electron, Proton & Neutron |
 82%
From NCERT
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Which of the following has greater number of electrons than neutrons?

1. Al3+

2. O2-

3. F-

4. C

Subtopic:  Number of Electron, Proton & Neutron |
 75%
From NCERT
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The number of electrons in  19 K with quantum numbers n=3; l=0 is/are:

1. 2

2. 1

3. 4

4. 3

Subtopic:  Number of Electron, Proton & Neutron |
From NCERT
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