Why do elements in a group have similar properties?
They have the same number of electrons in their outer shell.
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Why do metals get more reactive going down a group?
When metals react they lose electrons, as the atoms get larger there are more occupied energy levels and so the electrons on the outer shell are less strongly attracted to the energy therefore are lost more easily.
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Why are the elements in group 1 called 'alkali metals'?
They readily react with air and water.
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Why does reactivity increase going down group 1?
The outer shell electron is less strongly attracted to the nucleus as atoms get larger so are easily lost and reacted.
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What are the main properties of transition metals?
Malleable, ductile, strong, dense, high melting and boiling points and good conductors of heat and electricity.
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Why do te halogens have low melting and boiling points?
They have small molecules made of pairs of atoms.
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How was mendeleev's table an improvement on Newlands table?
Mendeleev left gaps for undiscovered elements.
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What was Newlands law of octaves?
The elements were arranged in order of atomic weight where every eighth element had similar properties.
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Why does reactivity decrease going down group 7?
The attraction of the outer shell electrons to the nucleus decreases as atoms get larger.
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At room temperature what are the colours of the halogens?
Fluorine is a yellow gas, Chlorine is a green gas Bromine is a red liquid and Iodine is a grey solid.
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Other cards in this set
Card 2
Front
Why do metals get more reactive going down a group?
Back
When metals react they lose electrons, as the atoms get larger there are more occupied energy levels and so the electrons on the outer shell are less strongly attracted to the energy therefore are lost more easily.
Card 3
Front
Why are the elements in group 1 called 'alkali metals'?
Back
Card 4
Front
Why does reactivity increase going down group 1?
Back
Card 5
Front
What are the main properties of transition metals?
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