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atom

Across
Outside the nucleus and has a negative charge
performed a CRT experiment and determined that the ray was composed of negative particles, call these electrons, determined the mass-charge ratio for an electron, came up with the "plum pudding" model of the atom
The number of protons and nutrons
developed the quarantined orbit model of the atom, electrons can only reside in certain energy levels
Out side of the nucleus
More than 2 element combined
In side the object
determined the Law of Conservation of Matter by extensive experimentation
How many protons they have in the element
A timeline of the atom
Down
Fund the nutron
It has a neutral charge
The electrons on the otter shells
The one who introduce atom
expanded the idea that electrons behaved as particles AND waves, this developed the quantum mechanical model of the atom
formulated an atomic theory of matter with 4 postulates: 1. Elements are composted of small particles called atoms. 2. All atoms of a given element are identical. * 3. Atoms are neither created nor destroyed in chemical reactions. 4. Compounds always contain the same proportion of elements.
Has all the elements
performed the gold foil experiment, determined that atoms contained a very small, positively charged core at the center, called this core the nucleus, came up with the nuclear model of the atom (with electrons orbiting around the nucleus)
Made of on kind of material
It has a positive charge