CHEM 101 – General Chemistry I Chapter 2 Reading Assignment Pages 31 - 60 2.1 – What is Matter Made Of? Who 1st discovered atoms – Democritus where the first person to discover atoms. His followers would often think that there were multiple kinds of atoms and not just plain atoms. 2.2 – How Do We Classify Matter? Elements – A substance that consists of identical atoms. Today there are 116 known elements. Example – C= Carbon; H= Hydrogen Compounds – A pure substance made up of two or more elements
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Sodium From Wikipedia‚ the free encyclopedia This article is about the chemical element. For the PlayStation Home game‚ see Sodium (PlayStation Home). For the racehorse‚ seeSodium (horse). "Natrium" redirects here. For the town in West Virginia‚ see Natrium‚ West Virginia. Sodium 11Na
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Ruthenium often called its symbol‚ Ru‚ which atomic number is 44 and the atomic mass is 101.07 u ± 0.02 u. This element is known to have 27 radioactive isotopes but 7 regular isotopes. Ruthenium is solid at room temperature and looks like a hard‚ silvery-white metal with a shiny surface ( See page 2 for picture. ).The 3 main types of subatomic particles are protons‚ neutrons‚ and electrons. To humans Ruthenium is highly toxic and carcinogenic‚ and shouldn’t be touched if came into contact with.
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number - from hydrogen (1) to whatever is the highest one currently known (>105). It is arranged so that similiar members fall in a list such as Chlorine Bromine etc.. The average atomic weight is usually shown with each element‚ but due to isotopes (caused buy nuclear varations) the weight is the normal average atomic weight. The table illustrates the similiarity of various elements such as metals‚ noble gases‚ rare earths‚ halides‚ etc. in that they fall into series within the table. The
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1. The earth consists of iron‚ oxygen‚ silicon and magnesium. This makes up about 90% of the earth’s elements. Jupiter and Saturn on the other hand consist mostly of volatile gases like water‚ methane and ammonia. These two planets retained their volatiles due to their greater gravitational force. 2. Scientist believe that the collision of earth with a smaller body caused the earth to tilt on it axis at 23 degrees. The blasting debris is said to have formed the moon. The period from the accretion
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There’s a place called Uranium That just can’t be beat From preserving our food To giving us heat This place called Uranium Helps us people a lot Even though it is tiny‚ Much smaller than a dot If you’ve never heard of Uranium Well‚ you’re in for a treat So just sit back‚ relax And I’ll tell you something neat About this place called Uranium That’s really pretty cool In fact it’s much like your Town‚ church‚ or school There are a couple things though That you’ll have to get used to Before you understand
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Physics Final Exam revision b 11/7/14 Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in probation or possible
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The nature and significance of radioactive waste Radioactive waste typically comprises a number of radioisotopes: unstable configurations of elements that decay‚ emitting ionizing radiation which can be harmful to humans and the environment. Those isotopes emit different types and levels of radiation‚ which last for different periods of time. Sources of waste Radioactive waste comes from a number of sources. The majority of waste originates from the
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Dalton’s theory are that his second law that all atoms of the same element are the same is false because today we have found that there are other kinds of atoms called isotopes. An isotope is an atom that has the same amount of electrons and protons‚ but it has more neutrons that increase its atomic mass. Some examples of isotopes are Carbon 12‚ carbon 13‚ carbon 14‚ Uranium (234‚ 235‚ and 238) and lithium (6‚ 7). Carbon 14 is especially useful because we know its rate of decay and can use to find
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element that maintains the properties of that element. • Chemical Group – the set of elements in the same column of the periodic table. These elements have similar physical and chemical properties. • Isotope – An isotope of an element has different number of neutrons. • Radioisotopes – Some isotopes are unstable‚ which means that the nucleus has a tendency to break apart and eject particles. Atoms that have unstable nucleus are called radioisotopes. • Subatomic particles – the particles of which
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