science:a pure substance that is made up of only one type of atoms is an?
477871
Element:\n\nA substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
873092
Matter can exist in either a liquid, solid, or gaseous state.  \nA) Iron nail is a solid\nB) Gasoline is a liquid unless you are speaking of the fumes that can be seen or smelled and then it is a gaseous state.
63599
check out the law of conservation of matter. it says that no matter what chemical reaction you look at matter can never be created nor destroyed.\nthat means the number of atoms of each type must be the same before and after a reaction takes place.
836870
Only one...otherwise, it would not be a pure element.
783521
Anything from the periodic table is pure. these are all basic elements that can't be broken down into other elements. examples: hydrogen, nitrogen, iron, zinc and gold.\nclick here for the table: http://www.chem.qmul.ac.uk/iupac/AtWt/table.html
585983
A homogeneous substance is made entirely of one kind of substance.  A heterogeneous substance is a combination of two or more different things.\n\nFor example, tomoato soup is homogeneous, but vegetable soup is heterogeneous.  A pure metal (like copper) is homogeneous, but an alloy (like brass) is made of a mixture of different metals.
815029
This is because element is a single atom, and therefore only absorbs energy at specific wavelength.
873154
Substances exist if they have a volume. Anything that has no volume is only imaginary.\nMasses exist in a form of volume structure with a mixure of space substance.\nHence,some masses are so small that they  cannot be visible. That doesnot means they dont exist or that they are considered massless because of being so small. This has been a misconception in the case of Photons. The atomic mass structure shown in the Periodic talble of elements is basically made up of complex atomic structures.. Never the less the atoms are all composed of the same substance,and all these substance have volume.\nSo atoms exist as they do because they are entity with volume. If it it was not so, they would not exist in our physical world.\n\nNow if they are substances outside of the Universe which are different,we have no scientific way presently to observe them.\n\nSo when Physics theories talk about masseless substance such as Photon and neutrinos etc. they are only conjecturing. And I only believe what appears to be real with actual positive proof.\n\nThe states in which atomic structures appears depend on their response to gravity pressure.and the temperature inside the atoms.\n At different temperature mass structure can appear as solid ,liquids ,gas or a gaseous ionized state called plasma.And most important of all the state of space substance which is the fifth state of matter.\nThese five states of Nature had been pondered upon by the Ancient Greeks such as Aristotle and others.
1032403
No because an atom is only a single element and thus such a "universe" would have no chemical composition except for the single atom it would have been made from
629980
Dalton's theory:\n\n*Elements are made of tiny particles called atoms. \n*All atoms of a given element are identical. \n*The atoms of a given element are different from those of any other element. \n*Atoms of one element can combine with atoms of other elements to form compounds. A given compound always has the same relative numbers of types of atoms. \n*Atoms are indivisible. Atoms are not created nor destroyed. A chemical reaction simply changes the way atoms are grouped together.\n\nThe only real difference is that the Law of Conservation of mass (last statement) isn't consistent with nuclear reactions. So atoms are not created nor destroyed in chemical reactions. They cannot be divided in a chemical process. The total mass AND energy of a system are conserved, since mass can be converted into energy in a nuclear reaction.
1160697
Don't know who told you that "atoms only consist of energy", but in general, that's nonsense. Atoms consist of electrons and the nucleus (protons and neutrons, which again are made up from quarks), and these particles have a well defined rest mass. Einsteins theory of relativity is well proved and gives us the famous equation E=mc^2 for the energy equivalence of a rest mass, *which does not mean that energy and mass are the same*. It just means that you can transform energy and mass into each other and are equivalent in a certain (relativistic) way.\n\nSo if you want to make a fool out of yourself: Go ahead and try to disproof Einstein, like thousands of fools have tried before. If you're really interested in physics, go and get some good books about the basics, and you're welcome to come back with some more serious questions.
170267
An atom is the smallest unit of any observable thing you can have. Atoms make up almost everything we can see.\n\nIt's name is Greek for 'Indivisable' but we have since found that atoms are made of protons, neutrons and electrons (and the first two are made of even smaller particles).\n\nAn element is a substance that is entirely comprised by only one type of atom. Gold, Tin and Oxygen are elements because they are made entirely of Gold, Tin and Oxygen atoms.\n\nMolecules and Compounds are similar in that they are made up of two or more atoms of different elements in a precise and defined ratio. Atoms in compounds can be ionically bonded. Molecules are, generally, covalently bonded.
141886
Chemists classify matter into substance and mixture. A substance may be an element or a compound whereas a mixture is physical mixing of two or more substances. In case of orange juice it is amixture of many substances (compounds) mostly dissolved in water, being the most abundent substance in the juice, and some tiny particles, referred as suspensions (collidial solution). Thus a chemist will not accept the phrase that a pure juce is a pure substance. It is a mixture.\nAs one friend answered, it is better to call fresh juice than to say a pure juice.\nThis concept applies to all most all juices from fruits and vegitables.
896817
No, an atom and an element are generally not the same thing.  An element is a much more general term than atom.  An atom refers to the smallest particle which still retains the same properties of the element.  An atom is just a atom, but Elements are made up of atoms of that element.\n\nYou might have a single Iron (Fe) atom, or you might have a sample of "elemental" Iron, which contains many Fe atoms.
312402
Chemical is a any substance having a defined molecular composition.  It can also be thought of as everything you see and touch except for light and electricity.
837196
A pure substance has a formula or symbol so we know exactly what atoms are in it in what proportion. \n\nIn a mixture there can be any material in any proportion.\n\nIn a solution, a type of mixture, there is one substance dissolved in another so that they are all mixed and anywhere we take a sample it will be the same.
516025
The phases of matter is only applicable to a pure substance. What is a pure substance? It is a substance which is chemically and physically homogeneous. Example would be water. Any portion of it can be taken and it will be sufficient to describe the rest of water left behind.\n\nWith the pudding, it is a heterogenous mixture both physically and chemically. So its phase cannot be determined since some of its part is not the same as the parts.