核分裂

• 木(tree; wood)RADICAL
• 亥(pig (12th zodiac sign))PHONETIC

The kernel of a tree fruit (木) sounds like the character for pig (亥).

• 八(divide; separate; eight)ASSOCIATIVE
• 刀(knife; blade; sword)RADICAL

Using a knife to chop something in half represents division or separation.

• 列(row; line up)PHONETIC
• 衣(garment; cloth)RADICAL

Cloth from clothing torn into strips arranged in rows shows how things split apart.