If an element has the atomic number 20, what sublevels are present?
It has a p sublevel.
The first energy level has an s; the second energy level has an s and a p; the third energy level has an s, p, and d; the fourth energy level has an s.
It has an s sublevel.
The first energy level has an s; the second and third energy levels have an s and a p; the fourth energy level has an s.
B?
look up CALCIUM's electron structure
To determine the sublevels present for an element with atomic number 20, we need to first examine its position in the periodic table. Atomic number 20 corresponds to the element calcium (Ca), which can be found in the fourth period (row) and the second group (column) of the periodic table.
To determine the sublevels, we can use the Aufbau principle, which states that electrons fill the lowest energy levels and sublevels first before moving to higher ones. The sublevels are denoted by the letters s, p, d, and f.
Starting with the first energy level, we have the s sublevel. Moving to the second energy level, we have the s and p sublevels. In the case of calcium, the third energy level also has the d sublevel. Finally, the fourth energy level only has the s sublevel.
Putting this information together, we can conclude that the sublevels present for an element with atomic number 20 are: s, p, and d.