The task is to identify which word correctly collocates with "weapon" among the given options. In English, a collocation is a combination of words that are often used together. Let's analyze the options:
nuclear weapon
Commonly used term referring to weapons that derive their destructive power from nuclear reactions.
atomic weapon
Less common, typically synonymous with nuclear weapon, but "nuclear weapon" is the prevalent collocation.
molecular weapon
Not a standard term; molecules relate to chemistry and do not collocate with weapon in a conventional sense.
electronic weapon
Not a standard term; electronics may be involved in weaponry but do not directly collocate with weapon.
Based on standard English usage, the correct collocation is "nuclear weapon."