Question

value: 3
unstable nuclei have a very ___ number of protons and neutrons.

a. unequal

b. equal

c. large

d. small

Explanation:

To determine the correct answer, we analyze the concept of unstable nuclei. Unstable nuclei (like in radioactive decay) often have an unequal number of protons and neutrons. A nucleus with an equal number of protons and neutrons is more stable for lighter elements, but for instability, the key factor here relates to the balance between protons and neutrons. "Large" or "small" alone don't directly define instability in terms of proton - neutron count; rather, the imbalance (unequal) is a key factor. So the correct option is a.

Answer:

a. unequal