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establishment OF POLLUTION - FREE GROUND LEVEL contrast 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 adjourn 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 trope o f an piece. 4. The bout of protons tells you what the agent 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 proton (1 amu), 2 neutrons (2 amu), and 1 electron, t! otaling 3 amu. ISOTOPES Def: Atoms of the very(prenominal) element that select 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, heavy hydrogen 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, couch it on our website: BestEssayCheap.com

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