a tabular arrangement of chemical elements organized based on their atomic number, electron configuration, and recurring chemical properties

周期表, 元素周期表
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

同位素, 同素异形体
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

卤素, 卤族元素
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

惰性气体, 贵气体
a mixture of two liquids where tiny droplets of one are evenly dispersed in the other, like oil in water

乳化液, 乳剂
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

半衰期, 半生期
the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei in radioactive substances

放射性, 辐射性
a type of uranium that has most of its more radioactive isotopes removed, primarily used for armor-piercing ammunition and shielding

贫铀, 耗尽铀
