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Periodicity (The Modern Periodic Table (We can explain trends in…
Periodicity
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Group 1 - Alkali Metals
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The metals all react with water to produce Hydrogen and an alkaline solution containing the metal Hydroxide
They form 1+ ions in reactions to make ionic compounds. These are generally white and dissolve in water, giving colourless solutions
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The Transition Metals
Compared with the Alkali metals, Transition elements have much higher melting points and densities. They are also stronger and harder, but much less reactive.
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A transition metal can form ions with different charges, in compounds that are often coloured.
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The Early Periodic Table
The Periodic Table of elements developed as chemists tried to classify the elements. It arranges them in a pattern in which similar elements are grouped together.
Newlands' table put the elements in order of atomic mass but failed to take account of elements that were unknown at that time.
Mendeleev's Periodic Table left gaps for the unknown elements, and so provided the basis for the modern Periodic Table