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The atomic number for Lithium on the periodic table is 3.
The atomic number basically represents the total number of protons in an atom.
Therefore, the total number of protons in Lithium is 3.
While defining the atomic mass of an element, it is generally the number of neutrons and protons of an element.
As indicated on the periodic table, the atomic mass of Lithium is 7.
Therefore, the number of proton in Lithium = 3
Atomic Mass of the Lithium = 7
The atomic mass of an element = Number of Proton + Number of Neutron
Number of Neutron = Atomic mass of an element – Number of protons of the element
Number of Neutron = 7 – 3
This implies, Number of Neutron = 4
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Now, coming to the number of electrons of Lithium, as an atom is neutral in charge, the number of protons that are positively charged is equal to the number of electrons that are negatively charged.
Therefore, the electrons in a Lithium ion need to be 3 but lithium as a metal donates the electron.
So to have a+1 charge, Lithium must have lost an ion.
Therefore the number of electrons in Lithium is 2.
We can conclude that the Lithium ion has
Atomic number = 3
Atomic Mass = 7
Number of Protons = 3
Number of Neutrons = 4
Number of Electrons = 2
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