How Many Electrons Are in the Outer Shell of Hydrogen

Dmitri Mendeleev published the first periodic table in 1869. They are the electrons involved in chemical bonds with other elements.

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For example Ca 2 has a 2 charge therefore it has 2 fewer electrons than a neutral calcium atom.

. Every element in the second column group two has two electrons in the outer shell. Every element in the first column group one has one electron in its outer shell. Calciums atomic number is 20 therefore this ion has 18 electrons.

Those outer electrons are also called valence electrons. To determine how many electrons are left subtract the amount of charge from the atomic number. As you keep counting the columns youll know how.

In this case there are more protons than electrons. He showed that when the elements were ordered according to atomic weight a pattern resulted where similar properties for elements recurred periodicallyBased on the work of physicist Henry Moseley the periodic table was reorganized on the basis of increasing atomic number rather than on atomic weight.

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