The classification with 1A, 7A etc. is not recommended by IUPAC and is obsolete.
The 1A elements are alkali metals, all solids; the 7A elements are the nonmetals (halogens). Halogens can be gaseous, liquids or solids at room temperature.
The elements in group 1a to 8a called representative elements. This is due to the fact that they portray as wide array of chemical and physical properties.
Sometimes these are called the "representative" elements.
Sodium and Chlorine = Sodium Chloride Potassium and Iodine = Potassium Iodide
group 1A
because it has s1 configuration.
The elements in group 1a to 8a called representative elements. This is due to the fact that they portray as wide array of chemical and physical properties.
Sometimes these are called the "representative" elements.
bilat
Sodium and Chlorine = Sodium Chloride Potassium and Iodine = Potassium Iodide
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group 1A
because it has s1 configuration.
They follow a pattern for valence electrons.
The noble gases
valence electrons and electronic configuration.
Alkalene metals like hydrogen are present
cesium