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a tabular arrangement of chemical elements organized based on their atomic number, electron configuration, and recurring chemical properties
주기율표, 원소 표
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, leading to variation in atomic mass
동위원소
a type of chemical element found in Group 17 of the periodic table, known for being highly reactive and commonly used in disinfectants and lights
할로겐
any of the elements in Group 18 of the periodic table, including helium, neon, argon, krypton, xenon, and radon, characterized by their inert nature and stable electron configurations
귀족 기체, 비활성 기체
a mixture of two liquids where tiny droplets of one are evenly dispersed in the other, like oil in water
유 emulsion
the time required for half of a quantity of a substance to undergo a change or decay, typically in the context of radioactive decay or chemical reactions
반감기
the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei in radioactive substances
방사능, 방사성
a type of uranium that has most of its more radioactive isotopes removed, primarily used for armor-piercing ammunition and shielding
고갈된 우라늄, 축소된 우라늄
