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CHEMISTRY

Chemistry
How many neutrons does iron have

26
13
30
8

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Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 8, 10
2, 10, 8
2, 8, 8, 2
2, 6, 8, 4

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Chemistry
Nucleus of an atom consists of.

Proton
Electron, Proton and Neutron
Neutron
Proton and Neutron

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Chemistry
Which of the following is not a nucleon?

Electron
Positron
Neutron
Proton

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Chemistry
In an oxygen molecule, two atoms are united by

Four bonds
Three bonds
Two bonds
One bond

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