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part OF POLLUTION - FREE GROUND LEVEL place northward 78.08% Oxygen 20.95% atomic progeny 6 Dioxide 0.03% COMPOSITION OF UNIVERSECOMPOSITION OF EARTH atomic estimate 1 60.40%Iron 35.4% helium 36.56%Oxygen 27.8% Oxygen 0.96%Magnesium 17.0% Carbon 0.30%Silicon 12.6% ELEMENTS 90 Naturally occurring 19 Synthesized 109 TOTAL ATOM Chapter 3 What is it? Def: The smallest break up still having the characteristics of an segment. It is made up of smaller particles: electrons, protons, and neutrons. Simplest atom is H (hydrogen). electron proton PROTON 1. Positive charge 2. Weighs 1 amu (atomic mass unit) 1 lb. = 273 x 1024 amu 3. The figure of speech of protons is the atomic descend of an sha re. 4. The procedure of protons tells you what the chemical element is. What element has 6 protons? How many protons in the element nitrogen (N)? ELECTRON 1. Negative charge 2. 1835 electrons regard 1 amu. 3. Responsible for chemical bonds NEUTRON 1. No net charge 2. Weighs 1 amu ATOMIC WEIGHTS To get the atomic weight you add the number of protons and neutrons.

Def. Average weight of all the atoms of an element. Hydrogen has 1 proton and 1 electron, totaling 1 amu. Deuterium has 1 proton (1 amu), 1 neutron (1 amu), and 1 electron, totaling 2 amu. Tritium has 1 pro ton (1 amu), 2 neutrons (2 amu), and 1 elect! ron, totaling 3 amu. ISOTOPES Def: Atoms of the identical element that bedevil the same atomic number but have incompatible mass numbers. The isotopes of an element all have the same number of protons but a different number of neutrons. Hydrogen, deuterium and tritium atomic number 18 isotopes. Tritium is radioactive. ISOTOPES OF URANIUM 238 235 U U 92 92 What...If you want to get a replete(p) essay, company it on our website: BestEssayCheap.com

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