The periodic table: Elements compounds and mixtures: Chemistry: (9:1)

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13 Terms

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Atomic number

The number of protons in the nucleus of an atom

<p>The number of protons in the nucleus of an atom</p>
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Atomic mass

The average mass of all the isotopes of an element

<p>The average mass of all the isotopes of an element</p>
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Mass number

the sum of the number of neutrons and protons in an atomic nucleus

<p>the sum of the number of neutrons and protons in an atomic nucleus</p>
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Order of elements on historic periodic table

Elements were ordered by atomic weight

<p>Elements were ordered by atomic weight</p>
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Order of elements on modern periodic table

Elements are ordered by atomic number

<p>Elements are ordered by atomic number</p>
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Dmitri Mendeleev's ideas

Ordered elements by atomic weight BUT changed the order/left gaps to keep elements with similar properties in the same collumn

<p>Ordered elements by atomic weight BUT changed the order/left gaps to keep elements with similar properties in the same collumn</p>
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Advantages of Mendeleev's ideas

He was able to predict the properties of elements in the gaps.

<p>He was able to predict the properties of elements in the gaps.</p>
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Group

A vertical column of elements with the same number of outer shell electrons

<p>A vertical column of elements with the same number of outer shell electrons</p>
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Period

A horizontal row of elements with the same number of electron shells

<p>A horizontal row of elements with the same number of electron shells</p>
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Physical properties

observed or measured characteristics of a substance. (e.g. colour, density)

<p>observed or measured characteristics of a substance. (e.g. colour, density)</p>
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Chemical properties

How a substance reacts with other substances.

<p>How a substance reacts with other substances.</p>
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Example of Mendeleev pair reversal

Tellurium is heavier than Iodine, but Iodine fits best into the halogens

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IUPAC Groups

Give numbers to the transition block, so old group 3 is now group 13 and so on