Group VII elements are halogens.
Halogens exist as diatomic covalent molecules (the 2 atoms within each molecule are held together by strong covalent bond) and they are very reactive non-metals.
Physical properties:
On going down the group from Fluorine to Astatine,
- the melting and boiling points of the halogens increase. Chlorine is a gas, bromine is a liquid and iodine is a solid at room temperature.
- the colour of the halogens become darker. Chlorine is greenish-yellow, bromine is reddish-brown and iodine is purplish-black.
Chemical properties:
- Halogens react with most metals to form salts called halides.
- The reactivity of halogens decreases down the group. Fluorine is the most reactive. This is because the atomic size of the halogens increases down the group. It becomes more difficult for the nucleus to attract an electron into the valence shell to become an ion.
- A more reactive halogen will displace a less reactive halogen from an aqueous solution.
Group 18.
They are called noble gases or inert elements. Belong to group 8A or 18 They are called noble gases or inert elements. Belong to group 8A or 18 They are called noble gases or inert elements. Belong to group 8A or 18
The group 8 contain Fe, Ru, Os, Hs.
Group 8A in the periodic table is the noble gas group. It includes helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) Radon (Rn) and the unnamed element ununoctium (Uuo).
Noble gases are located in Group 18 (also known as Group 8A) of the periodic table.
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Group 8a
Group 18.
the most stable element group is the noble gases group
They are called noble gases or inert elements. Belong to group 8A or 18 They are called noble gases or inert elements. Belong to group 8A or 18 They are called noble gases or inert elements. Belong to group 8A or 18
noble gases
Group 8A elements have 8 valence electrons. This means that the highest occupied energy level in Group 8A elements will have 8 electrons, as the maximum number of electrons in an energy level is 8 based on the octet rule.
The group 8 contain Fe, Ru, Os, Hs.
At room temperature, all noble gases are gases. These include helium, neon, argon, krypton, xenon, and radon.
Noble Gases, Group 8A
Column 18 or group 8A
No. They are noble gases and will not react under normal conditions.