Question

PLEASE HELP FAST! A p sublevel is represented by the quantum number (2 points) m subscript l = 1 m subscript l = 2 l = 1 l = 2

Answer 1

$l = 1$.

Explanation

Each electron in an atom comes with a unique set of four quantum numbers.

• $n$ gives the main shell of an electron.
• $l$ gives the type of the sub-level (a.k.a. orbital, s, p, d, f, ...) that the electron occupies.
• There can be more than one orbitals in a sub-level. Consider $m_l$ as the index for the electron's orbital.
• Each orbital holds two electrons. $m_s$ tells those two electrons apart based on the direction of each electron's spin.

The question is asking about different types of sub-levels. That depends on the angular / azimuthal quantum number, $l$.

$l$ is an integer. It ranges from $0$ all the way to $n - 1$.

• An electron with $l = 0$ is in an $s$ orbital.
• An electron with $l = 1$ is in a $p$ orbital.
• An electron with $l = 2$ is in a $d$ orbital.

In other words, the quantum number $l= 1$ represents a $p$ sublevel.

Reference

Vitz, Ed et al. "Quantum Numbers (Electronic)", ChemPRIME (Moore et al.). Chemistry Libretexts.

"Quantum Mechanics and Atomic Orbitals", Chemistry - The Central Science (Brown et al.). Chemistry Libretexts.