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ATOMS ELEMENTS AND THE PERIODIC TABLE 3

Horizontales
An element in group 7 of the periodic table. For example, Br or Cl.
An ion with a 1– charge formed when a halogen atom gains an electron. E.g. Cl–, Br– etc.
An element in group 1 of the periodic table. For example, K or Na (two words).
A wide range indicator that changes colour depending on the pH of the solution that it’s in (two words)
A group 7 (halogen) which exists as a yellow poisonous gas.
An element in group 0 of the periodic table. For example, Ne or Ar (two words).
A charged particle formed when one or more electrons are lost or gained from an atom or molecule.
A compound that contains positive and negative ions held together in a regular arrangement (a lattice) by electrostatic forces of attraction.
Verticales
Gas formed when group 1 metals react with water.
A reaction where a more reactive element replaces a less reactive element in a compound.
A group 7 (halogen) which exists as a green poisonous gas.
A substance made up of only one type of atom.
An alkaline substance formed when group 1 metals react with water.
A group 7 (halogen) which exists as a grey solid and sublimes to form a purple poisonous vapour.
A group 7 (halogen) which exists as a brown liquid.
Type of compound formed when group 1 metals react with oxygen.