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CHEMISTRY PUZZLE

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