Atom+Facts

How small are atoms? Seeing an Atom https://www.ted.com/talks/just_how_small_is_an_atom https://www.youtube.com/watch?v=ipzFnGRfsfE https://www.youtube.com/watch?v=N-FfVLOBccI https://www.youtube.com/watch?v=8ypo6wGqIGY [|Bananas]

Protons, neutrons, and electrons are the three particles that make up atoms. Different kinds of atoms have different numbers of these particles. Protons and neutrons are found in the nucleus of an atom. The number of protons in an atom's nucleus determines what kind it is. Even though the nuclei of atoms are tiny, they contain all most all of the mass atoms. Electrons are found in a much larger area around the nucleus. 1,836 electrons have the same mass as one proton or neutron. The three particles that make up atoms have different charges. Protons have a positive charge, neutrons have no charge and electrons have a negative charge. Remember that opposite charges attract and this is also true for protons and electrons. Usually atoms have a neutral charge, because each proton in the nucleus will attract an electron to the atom. Sometimes the number of electrons will be more or less than the number of protons. The atom will have a charge, but it will still be the same kind of atom. The Periodic Table lists all the different kinds of atoms in the order of increasing atomic number. The atomic number of an atom is the number of protons in its nucleus. Atomic number is the smaller number usually at the top of the atom's cell in the periodic table. Each kind of atom also has a name and one or two letter symbol. The larger number at the bottom of the atom's cell is called Atomic Mass. Atomic mass is the average mass of an elements atoms. An atom's Atomic Mass is almost totally due to the protons and neutrons it contains. (Electrons have very little mass.) This means an element's Atomic Mass is the mass of its nucleus. Remember, that an atom's nucleus contains protons and neutrons, so an atom's Atomic Mass is the mass of its protons and neutrons. Thus, subtracting an element's Atomic Number from its Atomic Mass will give the number of neutrons in the element's atoms. Just round to the closest whole number. All atoms of an element have the same number of protons, but they can have different numbers of neutrons. Atoms of the same kind with different numbers of neutrons are called isotopes. The reason the Atomic Mass of most elements is a decimal is because of isotopes. (Go to the Wooden Periodic Table and explore the different elements.) http://theodoregray.com/periodictable/

How small are atoms? https://www.youtube.com/watch?v=yQP4UJhNn0I https://www.youtube.com/watch?v=_lNF3_30lUE

Why isn't everything transparent? https://www.youtube.com/watch?v=VwRLIt6jgdM

http://physicalsciencecottrell.wikispaces.com/Atomic+Structure+Facts Neutrons are Invisible http://www.fnal.gov/pub/today/archive/archive_2014/today14-08-29.html

Atoms - empty space http://www.pbslearningmedia.org/resource/phy03.sci.phys.matter.atoms/atoms-the-space-between/

More http://phys.org/news/2012-03-physicist-einstein-beaten-bohr-famous.html http://phys.org/news/2010-01-dispute-einstein-bohr.html#nRlv http://phys.org/news/2011-10-clock-quantum-mechanics-relativity.html#nRlv https://www.quora.com/What-is-the-difference-between-Niels-Bohrs-and-Albert-Einsteins-theories-of-quantum-mechanics https://www.quora.com/How-can-the-disagreement-between-Einstein-and-Bohr-be-explained-to-a-layman

Quantum Physics https://www.youtube.com/watch?v=voUi8RtmVRw