ByJuriD5
The sum of protons and neutrons equals the atomic mass. For example, for lithium, the atomic mass is 6.94 and the number of protons is 3. That means 6.94 minus 2 equals 3.94. That should be the number of electrons. But lithium has 3 electrons. So, is that simply reduced from 3.94 to 3?
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The decommissioning points therefore come that there are different variants, the isotopes, from lithium as from any other element.
They differ from one another by their neutron number, whereby the atomic mass is also different. The atomic mass in the periodic system is the average. However, the number of electrons is the same for all isotopes of an element and corresponds to the number of protons, in the case of lithium 3.
The sum of the Proton NUMBER and the Neutron NUMBER yields the mass NUMBER.
The exact masses of protons, neutrons and cores are quite different.
The electrons are a completely different subject.
The number of electrons should be equal to the number of protons, i.e. 3.