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CHEMISTRY PUZZLE

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Across
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A chemical link formed between atoms in a molecule and ions in the crystal.
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The density of this element decreases with the increase in altitude.
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Am element with atomic number 4
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The lightest metal in group 1
Down
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A negatively charged ion
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A pair of electron which are not involved in bonding.
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Yellow coloured element with symbol Au
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Sodium burns with...……….. flame.
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Electrically charged particle
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A Group of 8 valance electrons around an atom