noun
COLLOCATIONS FROM OTHER ENTRIES
a chain of atoms/molecules etc technical:
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Most fabrics are made of long chains of molecules.
an atom/atomic bomb
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Oppenheimer was the father of the atomic bomb.
COLLOCATIONS FROM CORPUS
■ ADJECTIVE
other
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In other cases atoms take the place of ions in regular lattice positions.
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Most other atoms can join up comfortably only with one, two, or three others at a time.
single
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In crystallography, each lattice point can accommodate more than a single atom .
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And the amount the tip is moved reveals the height of the protuberance, even if it is only a single atom high.
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The detection of single atoms in this way has caused great excitement because of its application in many areas.
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By the time it hits a distant screen, this ion-image has expanded millions of times. Single atoms can be resolved.
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In other words, only certain discrete energies would be permitted, exactly as for an electron confined in a single atom .
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Dalton never saw an atom , or the effects of a single atom.
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A single atom of copper is still a piece of copper.
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It is formed when the sun's ultraviolet radiation breaks up the two atoms of oxygen molecules into single atoms.
small
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We could detonate a very small atom bomb in the vicinity of another.
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Even a charge of conventional explosive in the vicinity of a small atom bomb would suffice.
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If the small atom bomb went up, so then would the hydrogen bomb.
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However, on the small scales of atoms and molecules, electromagnetic forces dominate.
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Pretty small for an atom bomb, I would have thought. 4000 kilotons.
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When small atoms bond together through ionic or covalent chemical bonds, the compactness of the bond makes it extremely strong.
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Carbon is the smallest atom in the fourth column of the periodic table of elements.
■ NOUN
bomb
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We could detonate a very small atom bomb in the vicinity of another.
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A fart is not an atom bomb ....
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Even a charge of conventional explosive in the vicinity of a small atom bomb would suffice.
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If the small atom bomb went up, so then would the hydrogen bomb.
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Teller, of course, worked on the atom bomb and the H-bomb.
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Britain has already accumulated enough nuclear waste to build 5,000 atom bombs .
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Then war intervened, Oppenheimer became involved in the atom bomb project, and he lost interest in gravitational collapse.
carbon
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Buckyballs, of buckminsterfullerene, are soccer-ball-shaped assemblages of 60 carbon atoms .
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Any molecule with this group attached to a carbon atom is called an alcohol.
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The two substances differ from each other only in the geometric pattern with which the carbon atoms are packed.
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In this group of ions the carbon atom is surrounded by three oxygen atoms in a planar triangle.
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In diamonds, the carbon atoms are packed in a tetrahedral pattern which is extremely stable.
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The hydrogen-to-#carbon atom ratio is perhaps a better index.
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This leaves one electron on each carbon atom unaccounted for.
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This is illustrated in Figure 4. 2 which shows the hydrogen-to-#carbon atom ratio of various hydrocarbon.
hydrogen
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By supplying addition molecules of chlorine it is possible to replace all the hydrogen atoms .
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The optimum proportions of hydrogen and oxygen are thus two hydrogen atoms per oxygen atom, exactly the same as in water.
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This is about the energy that would be released if a hydrogen atom could be totally converted into energy.
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A methyl group is a carbon with three hydrogen atoms attached.
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One of the hydrogen atoms in ammonia is replaced by a benzene ring.
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Instantly, one of the hydrogen atoms on the ethanol molecule is ripped off.
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It consists of a chain of carbon atoms , with one hydrogen atom attached to each carbon.
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The microcosm becomes the macrocosm: the key to the whole universe may well be hidden in one hydrogen atom .
oxygen
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Thus, in our example, no magnesium, carbon or oxygen atoms can be created or destroyed.
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In this group of ions the carbon atom is surrounded by three oxygen atoms in a planar triangle.
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The clays consist of silica tetrahedra and the octahedra contain magnesia surrounded by oxygen atoms and hydroxyl groups.
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Is there a molecule that weighs the same as an oxygen atom ?
■ VERB
charge
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That instrument was designed to produce a beam of electrically charged atoms from the sample to be studied.
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The electrical charge used by neurons is carried by ions-those electrically charged atoms mentioned previously.
contain
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For example, one molecule of oxygen contains two atoms of oxygen.
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One molecule of ammonia contains one atom of nitrogen and three atoms of hydrogen.
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Each contains five atoms , giving nine normal vibrations.
form
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Nor would these, together with electrons, form separate, well-defined atoms .
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Quarks unite to form protons, neutrons and electrons, which in turn unite to form atoms .
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The sub-atomic particles are arranged to form the atoms , and different numbers, types and arrangements of atoms form the molecules.
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If the recoiled atom is directed towards a neighbouring atom, a blocking cone is formed behind the neighbouring atom.
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Negative ions can also be formed when an atom has an extra electron bolted on.
show
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Then J.J. Thomson showed that these atoms of charge exist; we call them electrons.
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They are named after the man who inferred their existence from weak attractive forces shown by atoms and molecules in gases.
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A formula of an ion shows the ratio of atoms of each element present in the ion.
EXAMPLES FROM OTHER ENTRIES
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an atom of truth
EXAMPLES FROM CORPUS
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In graphite the carbon atoms are arranged in flat hexagons layered on top of each other.
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Quarks unite to form protons, neutrons and electrons, which in turn unite to form atoms.
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Talk of probability waves and eigen values does not undermine the reality of atoms and molecules.
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The formula also shows the number of moles of atoms of each element in one mole of molecules.
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The valency of an atom in a covalent molecule is the number of electrons shared by the atom in forming the bond.