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A World of Atoms, Elements & Compounds
Transcript of A World of Atoms, Elements & Compounds
John Dalton created the atomic theory. The atomic theory is :
Nucleus - center of atoms
Proton- positive charge
neutron- no charge
electron- negative charge
Isotopes are atoms that have the same number of protons, but different number of neutrons. Atoms An element is a pure substance that's made up of only one kind of atom. Scientists hypothesize that all of the naturally occurring elements were formed from hydrogen in the stars except for hydrogen. Elements Plasma is a state of matter similar to gas in which a certain portion of the particles are ionized. Heating a gas may ionize its molecules of atoms (reduce or increase the number of electrons in them), thus turning it into a plasma, which contains charged particles: positive ions and negative electrons or ions Plasma Dmitri Mendeleev organized the periodic table of elements according to their atomic mass. The atomic mass of an atom is it's number of protons, neutrons, and electrons, but we don't count the electrons because it is 1/1,836 atomic mass unit. Later, scientists realized that the table would be more useful if it was based on it's atomic number-the number of an atom's protons-rather than atomic mass. Periodic Table of Elements A metal is a element that conducts heat and electricity well. Most of the known elements-about 75% are are metals. They are shiny, and malleable.
A nonmetals do not conduct electricity, and they aren't shiny or malleable. Metals & Nonmetals
1) red litmus turns blue
2) bitter taste
4)ph greater than seven Bases Acids 1) blue litmus turns red
2) ph less than seven
3) sour tasting A world of Atoms, Elements, & Compounds By Paige and Hannah