Radium
The 3p sublevel is completed by the noble gas element Argon (Ar) which has 18 electrons in total.
The 5p sublevel is completed with 6 electrons with the addition of the element radon (Rn).
There is only one orbital in the 7s sublevel. The "7" corresponds to the principal quantum number and "s" indicates the sublevel shape, which is spherical.
The 2s sublevel can hold a maximum of 2 electrons.
Calcium is the element that has 2 electrons in the 4s sublevel.
The 2p sublevel is completed with six electrons and is found in elements from carbon (C) onwards. The seventh element, nitrogen (N), is the element that completes the 2p sublevel.
The 3p sublevel is completed by the noble gas element Argon (Ar) which has 18 electrons in total.
The element that completes the 4s sublevel is calcium (Ca). It has the atomic number 20, which means it has 20 electrons. The electron configuration of calcium is (1s^2 2s^2 2p^6 3s^2 3p^6 4s^2), indicating that the 4s sublevel is filled after the 3p sublevel.
The 5p sublevel is completed with 6 electrons with the addition of the element radon (Rn).
There is only one orbital in the 7s sublevel. The "7" corresponds to the principal quantum number and "s" indicates the sublevel shape, which is spherical.
This alkali metal is Rubidium Rb, having atomic no 37
The 2s sublevel can hold a maximum of 2 electrons.
Calcium is the element that has 2 electrons in the 4s sublevel.
The highest sublevel that Promethium can have is 4f. It is possible for 14 electrons to be placed around Promethium, since the elements in this sublevel each have 7 orbitals.
The element that has a single electron in the 2p sublevel is boron. The electron configuration of Boron is 1s22s22p1.
CARBON
Ne (neon) completes n3.