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Atom
The smallest part of an element that retains the identity of the element
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Electrons
A negatively charge particle within the atom
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Subatomic particles
A particle that is smaller than the atom
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Nucleus
In chemistry, the positively charged centre of an atom
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Protons
A positively charge particle that is part of every atomic nucleus
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Energy levels
A possible level of energy an electron can have in an atom
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atomic number
The number of protons in the nucleus of an atome
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Mass number
the sum of the number of protons and the number of neutrons in the nucleus of an atoms
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Isotopes
One of two or more forms of an element that have the same number of protons by a different number of neutron
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Bohr-Rutherford model
A model of the atom in which a central positive nucleus is surrounded by electrons in energy levels
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Atomic mass
The average mass of the naturally occurring isotopes of an element
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Periodic table
A system for organising the elements into columns and rows so that elements with similar properties are in the same colomn
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Metal
Typically an element that is hard, shiny, malleable, and ductile, and is a good conductor of heat and electricity
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Non-metal
Typically, and element that is not shiny, malleable, and ductile, and is a poor conductor of heat and electricity
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Metalloid
An element that shares some properties with some non metals and some metals
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Period
a horizontal row in the periodic table of elements
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Group
A vertical column of elements in the periodic table
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Allende electrons
An electron in the outermost occupied energy level of an atom
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Alkali metals
Far left group 1. Low melting point. Very reactive
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Alkaline metals
Group 2. Very reactive but less reactive than alkali metals.
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Halogens
Group 17. Highly reactive and extremely corrosive
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Noble gases
Group 18. More reactive than group 17
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