The 2s orbital is larger than the 1s orbital and is higher in energy.
1s and 2s orbitals differ in that 2s orbitals lie farther away from the nucleus in the next principle energy level. Other than that, they occupy the same shape of orbital, spherical, as indicated by the s.
Electrons start pairing in the 1s orbital. A 1s orbital can take two electrons, represented by 1s2.
the Pauli exclusion principle
The 1s orbital.
They all have a filled 1s orbital
the 2s orbital is at a higher energy level
The electron configuration of nitrogen is 1s^2 2s^2 2p^3. Nitrogen has a total of seven electrons, with two in the 1s orbital, two in the 2s orbital, and three in the 2p orbital.
1s
One only - 1s.
All of 11 electrons in sodium are in different electron orbitals: 2 electrons are in 1s orbital, 2 in 2s, 6 in 2p and 1 in the 3s orbital. (This last one is the so-called valence electron)
3 answer for apex
the first orbital to be filled is 1s because in this orbital the negatively charged electron is closer to the positively charged nucleus than in any other orbital Quoted directly from my Chenistry Text Book ( World of Chemisty Zumdahl/Zumdahl/DeCoste , p377 McDougal Littell 2007)