Beryllium has how many valence electrons in its last ring?
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Answer: 10.
There are 20 natural elements in the periodic table with (4n + 1) valence electrons, and 10 of them have 34 electrons in their outermost shell (last ring). The other ten elements each only have 30 electrons in their outermost shell, even though they can still block 18 electrons in their n-1 innermost shell (first ring).
When placed on the periodic table below the other transition metals, beryllium shares its spot with magnesium since both of these metal’s energy content is between sodium and potassium. Magnesium has 12 valence electrons; sodium has 11; potassium has 19; beryllium has 2. Each successive element represents another proton.