Zero. Calcium has two electrons in its 4s sublevel, and none in the 3d sublevel. The 3d sublevel doesn't start filling until after the 4s sublevel is filled.
Beryllium has four orbitals in its electron configuration.
The elements in the same period as sodium on the periodic table have the same number of electron orbitals. So, phosphorus, sulfur, chlorine, argon, potassium, calcium, and scandium would all have the same number of electron orbitals as sodium.
The electron configuration of calcium is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. This means that calcium has 20 electrons, with two electrons in the 1s orbital, eight in the 2s and 2p orbitals, and eight in the 3s and 3p orbitals, and finally two in the 4s orbital.
Boron has two electron orbitals - 1s and 2s. Each orbital can hold a maximum of 2 electrons.
Aluminium has three electron shells with 2,8,3 electrons each.
Beryllium has four orbitals in its electron configuration.
The elements in the same period as sodium on the periodic table have the same number of electron orbitals. So, phosphorus, sulfur, chlorine, argon, potassium, calcium, and scandium would all have the same number of electron orbitals as sodium.
The electron configuration of calcium is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. This means that calcium has 20 electrons, with two electrons in the 1s orbital, eight in the 2s and 2p orbitals, and eight in the 3s and 3p orbitals, and finally two in the 4s orbital.
Boron has two electron orbitals - 1s and 2s. Each orbital can hold a maximum of 2 electrons.
atomic orbitals and electron orbitals
Aluminium has three electron shells with 2,8,3 electrons each.
There are 27 electron containing orbitals in an atom of Iodine.
zero - after the 4s orbitals are filled at Calcium, the 3d orbitals start to fill - not until Gallium do the 4p orbitals start to fill.
Iodine has 7 electron-containing orbitals, corresponding to its 7 valence electrons in the p subshell. These orbitals can hold a maximum of 2 electrons each.
If it is in row 4 (4th period) it has 4 energy levels occupies. In the 2nd column (group 2A) it has 2 valence electrons. You ask how many orbitals it has. It has s and p orbitals. Is that what you mean? The configuration is 1s2 2s2 2p6 3s2 3p6 4s2 so there are 3 s orbitals and 6 p orbitals for a total of 9 orbitals.
Technetium has 43 electrons, so it has 43 orbitals.
Nitrogen has one electron in the 2s orbital and three electrons in the 2p orbitals.