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M,Rasberry

M,Rasberry

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Across
2.term that describes the horizontal rows of the periodic table
5.Credited with the discovery of the neutron.
6.term that describes vertical columns
8.credited with the discovery of the electron and the plum pudding model of atom
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.
12.credited with the development of an early atomic theory to explain the behavior of atoms.
15.used the now famous gold foil experiment to prove the existence of the nucleus.He also showed most of the atom is empty space.
18.a thing that is composed of two or more separate elements; a mixture.
19.Houses protons and neutrons
20.number of protons in the nucleus of an atom (2 Words)
21.No charge
Down
1.any group or atom with negative charge
3.Atoms that belong to the same element, have same number of protons, but different number of electrons
4.total number of protons and neutrons in nucleus (2 Words)
7.Any group or atom with positive charge
9.Positively charged particle
11.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.
13.smallest particle of an element that retains the properties of that element
14.Credited with the earliest idea of atoms existing. He was a greek philosopher.
16.Negatively charged particle
17.credited with planetary model of the atom that shows electrons orbiting the nucleus.

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