氮: nitrogen的: 4次方是 The fourth power of 2 i ...同位素: isotope铂的同位素: isotopes of platinum钙的同位素: isotopes of calcium汞的同位素: isotopes of mercury氦的同位素: isotopes of helium钾的同位素: isotopes of potassium金的同位素: isotopes of gold氖的同位素: isotopes of neon铅的同位素: actinium lead氢的同位素: deuterium; isotopes of hydrogen碳的同位素: isotopes of carbon氧的同位素: isotopes of oxygen氡的同位素: emanation钪的同位素: isotopes of scandium铊的同位素: isotopes of thallium锂的同位素: isotopes of lithium锎的同位素: isotopes of californium锘的同位素: isotopes of nobelium锫的同位素: isotopes of berkelium镝的同位素: isotopes of dysprosium激活的同位素: isotope activated大气的同位素成分: isotopic composition of atmospheric gases地球上的同位素: terrestrial isotope