Question

which orbital is closest to the nucleus? 1s²2s²2p³ 2p all the same energy 1s 2s

Explanation:

Step1: Understand orbital energy levels

Orbitals closer to the nucleus have lower energy. The principal quantum number \(n\) determines the energy level. For \(1s\), \(n = 1\); for \(2s\) and \(2p\), \(n=2\).

Step2: Compare \(n\) values

Since \(n = 1<2\), the \(1s\) orbital has a lower energy level (is closer to the nucleus) than \(2s\) and \(2p\) orbitals.

Answer:

1s