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WHSCHEM1ATOMS

M,Rasberry

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Across
3.an electron of an atom, located in the outermost shell (valence shell) of the atom, that can be transferred to or shared with another atom.
4.credited with the development of an early atomic theory to explain the behavior of atoms.
8.number of protons in the nucleus of an atom (2 Words)
12.Negatively charged particle
13.used the now famous gold foil experiment to prove the existence of the nucleus.He also showed most of the atom is empty space.
14.Atoms that belong to the same element, have same number of protons, but different number of electrons
16.No charge
19.term that describes the horizontal rows of the periodic table
20.Any group or atom with positive charge
Down
1.Credited with the discovery of the neutron.
2.credited with the discovery of the electron and the plum pudding model of atom
5.Credited with the earliest idea of atoms existing. He was a greek philosopher.
6.total number of protons and neutrons in nucleus (2 Words)
7.credited with planetary model of the atom that shows electrons orbiting the nucleus.
9.Houses protons and neutrons
10.cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms.
11.a thing that is composed of two or more separate elements; a mixture.
15.Positively charged particle
17.term that describes vertical columns
18.any group or atom with negative charge
21.smallest particle of an element that retains the properties of that element

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