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The haemoglobin molecule contains only four atoms of iron.血红蛋白分子只含有四个铁原子。Atoms consist of positively-charged protons, negatively-charged electrons and neutral particles called neutrons.原子由带正电的质子、带负电的电子和称为中子的不带电粒子组成。For centuries the atom was regarded as infrangible.有好几个世纪，原子一直被认为是不可分的。Dalton believed that the simplest compound of two elements must have one atom of each.道尔顿认为由两种化学元素组成的最简单化合物必须含有每种元素的一个原子。An atom itself is a complete whole, with its electrons, protons and neutrons and other elements.一个原子本身就是一个完整的整体，包括电子、质子、中子及其他元素。The splitting of an atom sets off an explosive chain reaction.原子分裂可造成一触即发的连锁反应。It was a long time before scientists could penetrate the mystery of the atom.很久以后科学家才洞悉原子的奥秘。Atoms of iron in the nail combine with atoms of oxygen from the air to form molecules of iron oxide, or rust.钉子里的铁原子与空气中的氧原子结合后形成氧化铁分子，也就是锈。Special instruments record the speed and motion of the atoms.特殊仪器记录原子的速度和运动。When heavy atoms are split in this way some loss of mass occurs.当重原子这样被分裂的时候，就会发生质量的减少。When energetic particles or quanta of radiation pass through a crystal, they excite a few of its atoms into a higher energy state.辐射性的高能粒子或量子穿过晶体时，会把晶体的一些原子激发成更高的能态。If one or more electrons be removed, the atom is said to be positively charged.如果原子失去了一个或多个电子，我们就说原子带正电荷。A molecule consists of two or more atoms.每个分子由两个或多个原子组成。An atom is the smallest indivisible particle of matter.原子是物质不可分割的最小粒子。What happens when an atom splits?原子分裂会出现什么情况?Atoms within the fluid interact with the minerals that form the grains.液体中的原子与形成颗粒的矿物相互作用。Atoms combine to form molecules.原子组合形成分子。He drafted the model of the atomic engine.他画了原子发动机模型草图。He patented the idea that the atom could be split.他的原子裂变观点获得了专利。We can balance the equation by multiplying the different atoms and molecules.我们可以通过增加不同原子和分子的个数来配平等式。Inside the atom there is a nucleus composed of neutrons and protons. The nucleus is crucial to the making of nuclear weapons.一个原子里面有由中子和质子组成的核，对制造核武器很重要。Quantum mechanics is the study of the way atoms behave.量子力学是研究原子运动的学科。The molecules of oxygen gas contain just two atoms.氧分子中只有两个原子。Atoms are made up of smaller particles - protons, neutrons and electrons - some of which are made up of even smaller ones, called quarks.原子是由更小的粒子，即质子、中子和电子组成的，其中有些是由更小的叫做夸克的粒子构成的。What happens at the atomic level when metals are hammered and pressed into shape has always been a mystery.当金属被锤压成型时，在原子水平上发生了什么一直是个谜。At the center of the atom is the nucleus.在原子的中心是原子核。 |