The distribution of electrons in the various shells of an atom is known as the electron configuration. The following table shows the electronic configuration of some atoms.
Table 2: Electric configuration of atoms of some elements
|Elements||Symbol||Atomic number||Energy shells and number of electrons in them|
How to draw the atomic structure of an atom?
To draw the atomic structure of hydrogen atom:
The atomic structure of some or the element are shown as follow:
The atomic number of hydrogen is 1 and its mass number is also 1.
Number of electrons = Atomic number = 1
Number of protons = Atomic number = 1
Number of neutrons = Mass number - Atomic number
Thus, the hydrogen atom contains only one proton in its nucleus at high speed in the lowest energy level.
|no. of electrons||1||0||0||0|
Mass no. = 4
Atomic Number = 2
Proton = 2
Neutron = 2
Electron = 2
The atomic number of helium is 2 and its mass number is 4. Therefore, it contains 2 electrons, 2 protons, and 2 neutrons.
|no. of electrons||2||0||0||0|
Mass no. = 7
Atomic no. = 3
Proton = 3
Neutron = 4
Electrons = 3
|no. of electrons||2||1||0||0|
Mass no. = 9
Atomic no. = 4
Proton = 4
Neutron = 5
Electron = 2, 2
|no. of electrons||2||2||0||0|
Mass no. = 11
Atomic no. = 5
Proton = 5
Neutron = 6
Electron = 2, 3
|no. of electrons||2||3||0||0|
The atomic weight of carbon is 6 and its mass is 12. Therefore, it contains 6 electrons, 6 protons, and 6 neutrons.
|no. of electrons||2||4||0||0|
What is the smallest particle which possesses the properties of a compound called?
The molecule is the smallest particle which possesses the properties of a compound.
What does 2n2 rule denote? Explain it with the help of two example.
The 2n2 rule is a rule which is used to determine the number of electrons that can exist different shell of atoms. For example: for k shell (n)= 1
No of electron in k-shell = 2n2
= 2 (1)2
No of electron in L-shell = 2n2
2 x 4
The tendency of an atom to have 8 electrons in their outermost shell is called octet. The tendency of an atom to have two electrons in their first shell is called duplet.
Give reason why neon is an inert gas?
Neon is an inert gas because its outermost orbit is fulfilled with 8 electron and it does not take part in chemical reaction.
Give the reason why the valency of oxygen is two?
The valency of oxygen is two because it gains two electrons during the chemical reaction.
The elements of group IA are called alkali metals because they easily react with water to produce alkali.
Chlorine is called reactive non-metals because it can easily gain one electron and possesses unit negative charge.
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