'Neutrons mass number' diaporamas de présentation

Chapter 2

Chapter 2. The Structure of the Atom and the Periodic Table. 2.1 Composition of the Atom. Atom - the basic structural unit of an element The smallest unit of an element that retains the chemical properties of that element. Electrons, Protons and Neutrons.

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Unit 2 Atomic Theory

Unit 2 Atomic Theory. Matter. All matter is made of atoms Alone as elements Au, Na, O, He In combination of elements as compounds H 2 O, NaCl , LiO 2. Early Theories of Matter. Democritus (460-370 B.C.) proposed & believed that Matter was not infinitely divisible

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John Dalton William Crookes J.J. Thomson Ernest Rutherford

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Proton

Proton A nuclear particle having a positive charge equal to that of the electron and a mass more than 1800 times that of the electron The number of protons in an atom is called the atomic number, Z.

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Warm Up

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Subatomic Particles

Subatomic Particles. Subatomic Particles. subatomic-lower (or smaller) than an atom Protons-positive particles Neutrons-neutral particles Electrons-negative particles. Location of particles. Protons and neutrons are in the nucleus (core) of the atom.

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Determining the number of subatomic particles in an atom

Determining the number of subatomic particles in an atom. Determining the number of protons. Atomic number (the number the periodic table is arranged by) is the number of protons in an atom. This number cannot change for a given element without changing the element.

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