Multi-Electron Configurations and Orbital Diagrams
The symbol of...
Question
The symbol of Helium atom is . How many neutrons are present in ion?
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Solution
The symbol of He atom is . This symbol, represents the chemical name and electronic information in the atom.
The superscript represents the mass number which is the sum of number of neutrons and protons.
The subscript represents the Atomic number which is the number of electrons present in the atom.
For helium, its mass number is 4 and Atomic number is 2.
We know that, in a neutral atom, the. Therefore, the number of protons in He is 2.
Subtracting the number of protons from Mass number we get the number of neutrons, i.e., 2
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In the given ion, He loses 2 electrons thus, the number of electrons is 0 and the number of protons is 2. The number of neutrons present in the ion will be 4-2 =2