Question

module - electrons in atoms test - 11/14/2025
diagram 1 represents an atom of hydrogen, showing the nucleus and the electron in the first energy level
what is represented by diagram 2?
() a negative ion of hydrogen.
an atom of hydrogen in the ground state.
a positive ion of hydrogen.
an atom of hydrogen in an excited state.

Explanation:

In Diagram 1, the electron is in the first energy level (ground - state). In Diagram 2, the electron has moved to a higher energy level. When an electron absorbs energy and moves to a higher energy level, the atom is in an excited state. A negative ion (anion) would have an extra electron, a positive ion (cation) would have lost an electron. Since the number of electrons is the same (1 electron) in both diagrams (just the energy level has changed), it is not an ion. And it is not in the ground - state (as the electron is in a higher energy level than in Diagram 1).

Answer:

an atom of hydrogen in an excited state