"Nucleus" is a singular noun. The plural form is "nuclei".
Nuclear is an adjective.Most English adjectives do not have separate singular and plural forms.Perhaps you were thinking of the noun nucleus (singular) or nuclei (plural).
the singular form of nuclei is nucleus
The singular form of nuclei is nucleus.
Nuclei is plural. Nucleus is singular.
Nucleus is singular; the plural form is nuclei (or some prefer nucleuses).
Yes. Hay is a singular noun. A Singular noun means one item only. So technically, hay is a singular noun.
The noun 'theory' is a singular noun. The plural noun is 'theories'.
Yes the word question is a singular noun. The plural noun is questions.
The noun mailbox is the singular form; the plural is mailboxes.
The noun school is the singular form.The plural noun is schools.
The noun 'fun' is a singular non-count noun, it has no plural form.