Wake-up. Parts of the Atom … from Discovery to Reality.

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Presentation transcript:

Wake-up

Parts of the Atom … from Discovery to Reality

Atom Smallest particle of an element

Two regions of the Atom 1. Nucleus: Small region located near the center of an atom

Two regions of the Atom Nucleus is made up of Protons (p + ) and Neutrons (n 0 )

Two regions of the Atom 2. Electrons (e - ): Surround the nucleus

Element The simplest substance that cannot be broken down by chemical means; consists of atoms which have the same number of protons

Chemical/Atomic symbol An abbreviation of a chemical element

Atomic Number The number of protons in a element

Atomic Number Location: Number above the chemical symbol

Mass Number The total number of protons and neutrons in the nucleus of an atom

Mass Number Location: Under the Atomic symbol

Notations What is the atomic mass of gold?

Notation Types Hyphen Notation Nuclear Symbol Au-197

How to find the number of electrons? The number of electrons is equal to the number of protons assuming neutral; look at atomic number

Example: How many electrons in the following element? 47

How to find the number of neutrons? The atomic number provides the number of protons The mass number provides the number of protons and neutrons Rounded Atomic Mass – Atomic number

47