What is the atomic mass/mass number of the atom in the diagram above? List the three statements that make up the modern atomic theory. Which is larger, a neutron or an electron? How many electrons are in the nucleus of an atom with an atomic number of 20? How many protons are in the nucleus of an atom with an atomic number of 15?

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Web 2 Electrons (Neutral Atoms) 20 Protons 86 Electrons, 125 Neutrons, 82 Protons O Neutrons 11.

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The Atoms In Each Unique Element Have A Specific Number Of Protons.

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Ü fire high energy electrons at sample ü from electrode gun ü knocks off an electron. Electrons (in a neutral charge atom only!); For the purposes of this chart, round all atomic masses to the nearest whole number. Each atom is made of subatomic particles called protons, neutrons, and.

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