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Atomic structure

This is a set of keywords from chapter.29 and 30

Atom Is the smallest particle of an element which still retains the properties of that element
Proton Protons are a sub-atomic particle found in the nucleus of an element. Protons have a positive charge ( 1 amu )
Electron Electrons are a sub-atomic particles found in the outer shells of an element. Electrons have a negative charge. ( 1/1840 amu )
Neutron Neutrons are a sub-atomic particles found in the nucleus of an element. They have a zero/ neutral charge. ( 1 amu )
Atomic mass unit Amu - unit used to measure the mass of sub-atomic particles
Sub-Atomic Particles Tiny particles inside an atom
Planetary Number The way in which electrons move about the nucleus in fixed paths called orbits or shells
Atomic Number Number of protons in that atoms nucleus
Atomic Mass The sum of the number of protons and neutrons
N= number N= the number of shells an atom has
Group Elements with similar properties are arranged under one another in vertical columns the columns are called groups
Period These are the horizontal rows of elements
Alkali Metals Are elements in group 1
Alkaline Earth Metal Are elements in group 2
Halogens Are elements in group 7
Nobel Gases Are elements in group 8. They do not react with other elements
Periodic Table Arrangement of elements in order of increasing atomic number
Isotopes Atoms of the same element that have different numbers of neutrons in the nucleus
Mendeleev He was a Russian chemist who arranged all the known elements in the form of a table. Because the properties of the elements repeated themselves it is known as the periodic table
Dalton English scientist who put forward his theory of the atomic structure. He said atoms could not be divided into anything simpler
Niels Bohr Proposed that electrons orbit the nucleus in fixed paths called orbits. These orbits are called shells
Molecule A group of atoms joined together. It is the smallest particle of an element that can exist independently
Octect rule Atoms strive to have 8 electrons in their outer shell to make them stable
Ionic bonding A force of attraction between positive and negative ions in a compound
Covalent bonding When electrons are shared between atoms
Ion Chemically charged element
Reduction When an atom gains an electron
Oxidation When an atom loses an electron
Created by: Annieramsden



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