Astable atom that has a large nucleus most likely contains more neutrons than protons. more protons than neutrons. equal numbers of protons and neutrons. changing numbers of protons and neutrons.

The right choice is "more neutrons than protons."

Explanation:

A nucleus is said to be stable if it cannot be transformed into another form without taking energy from the outside.

For example, nitrogen (₇¹⁴N)  has seven protons and seven neutrons.

For example: Stable iron(₃₀⁵⁶Fe) has 30 neutrons and 26 protons, an n:p ratio of 1.15,  This is because larger nuclei have more proton-proton repulsion, and require larger numbers of neutrons to separate protons from each other.

So, The right choice is:

"more neutrons than protons."

it would likely include more neutrons than protons.