Aufbau says that the sublevels fill 1s2, 2s2, 2p6. That would mean that you must have filled 1 and 2 s (=4) and 3 more. Last I checked, 3 + 4 = 7. Which element has 7 electrons?
I'll give you a hint: its atomic number is 7. Another hint: its symbol is N.
The valence electrons in an atom of nitrogen (N) are found in the 2s and 2p sublevels. There are a total of 5 valence electrons in nitrogen, with 2 in the 2s sublevel and 3 in the 2p sublevel.
Phosphorus has 3 electrons in the 4p sublevel.
There are three 2p orbitals and each can hold a maximum of two electrons with opposite spins, for a total of 6 electrons. This is true of the p sublevel in any energy level, except for the first energy level, which does not have a p sublevel.
To find the element with a 3p4 valence configuration, look in period 3 and group XVI, and that is ...S, sulfur.
There are 5 electrons in the highest occupied energy level of a nitrogen atom, since nitrogen has an electron configuration of 1s2 2s2 2p3. The 2p sublevel can hold a maximum of 6 electrons, but nitrogen only has 3 in its 2p sublevel.
The maximum number of electrons in the 2p sublevel is 6. The p sublevel has three orbitals, each of which can take two electrons.
The valence electrons in an atom of nitrogen (N) are found in the 2s and 2p sublevels. There are a total of 5 valence electrons in nitrogen, with 2 in the 2s sublevel and 3 in the 2p sublevel.
Phosphorus has 3 electrons in the 4p sublevel.
There are three 2p orbitals and each can hold a maximum of two electrons with opposite spins, for a total of 6 electrons. This is true of the p sublevel in any energy level, except for the first energy level, which does not have a p sublevel.
To find the element with a 3p4 valence configuration, look in period 3 and group XVI, and that is ...S, sulfur.
There are 5 electrons in the highest occupied energy level of a nitrogen atom, since nitrogen has an electron configuration of 1s2 2s2 2p3. The 2p sublevel can hold a maximum of 6 electrons, but nitrogen only has 3 in its 2p sublevel.
If the s and p sublevels are filled in an atom of an element in period 3, then the orbitals filled in this atom would be 1s, 2s, 2p, 3s, and 3p. Each s sublevel can hold a maximum of 2 electrons, while each p sublevel can hold a maximum of 6 electrons.
There is no such level as 2d. In 1st level there is just 1s. In the 2nd level there is 2s and 2p. Only in the 3rd level is there 3s, 3p and 3d. The sublevels of 3d are 3 dxy dyz dxz d(x2-y2) dz2 so 5 sublevels of 3d.
Selenium or Se
The element with 3 valence electrons in the 4d sublevel is Yttrium (Y). It is located in group 3 of the periodic table and has an atomic number of 39. In its electron configuration, Yttrium has the outer configuration of [Kr] 4d¹ 5s², contributing three valence electrons from the 4d and 5s orbitals.
The element with 3 valence electrons in the 4d sublevel is Yttrium (Y), which has the atomic number 39. Yttrium is located in group 3 of the periodic table and is characterized by its electron configuration of [Kr] 4d^1 5s^2. In this configuration, the 4d sublevel contributes one valence electron, while the 5s contributes two, totaling three valence electrons.
Nitrogen has 2s^3 2p^3 valence electrons so the answer would be 3