What element has 6 valence electrons and 6 energy levels?
The element that has 6 valence electrons and 6 energy levels is sulfur (S) with atomic number 16.
To find an element with 6 valence electrons and 6 energy levels, we need to refer to the periodic table. The number of valence electrons corresponds to the group number of the element, while the number of energy levels corresponds to the period number.
In this case, we need to find an element in the group 6 (since it has 6 valence electrons) and in the period 6 (since it has 6 energy levels).
Looking at the periodic table, we can see that group 6 is called the "Chalcogens" and period 6 is the sixth row of elements. The element that fulfills both criteria is the element with atomic number 76, which is Osmium (Os).
Therefore, Osmium (Os) is the element that has 6 valence electrons and 6 energy levels.