閉へい殻かく

noun

closed shell (biology)

In biology, refers to a shell that is closed or sealed, often in the context of mollusks or other shell-bearing organisms.

• この種しゅの貝かいは、危き険けんを感かんじると閉へい殻かくする。

  This species of shellfish closes its shell when it senses danger.

noun

closed shell (physics/chemistry)

In physics and chemistry, describes an electron configuration where all electron shells are completely filled, leading to chemical stability.

• 希きガスは閉へい殻かく構こう造ぞうを持もつため、化か学がく的てきに安あん定ていである。

  Noble gases have a closed-shell structure and are therefore chemically stable.