Question

Group1 [1A] elements are called alkali metals

Answer 1

$\bold{MODERN \: PERIODIC \: TABLE}$

A table in which elements are arranged in group or periods according to their atomic number. By the modern periodic law which states that "The physical and Chemical properties of elements are periodic function of their atomic number ."

◼It have 18 groups and 7 peroids.

▶1 group elements are called alkali metals .

▶2 group elements are called alkali earth metals .

▶3 -12 group elements are called transition metals .

▶13 -17 group elements are called non metals.

▶18 group elements are called inert metals .

$\bold{PROPERTIES \: OF \: GROUP \:1 \: ELEMENTS }$

▶They are univalent which means have one electron in outermost shell.

▶They loses electrons hence arr strong reducing agent.

▶They are highly reactive, electro positive metals and good conductor of heat and electricity.

▶They form electrovalent compounds with non metals.

$\bold{1st \: group \: elements \: are \: called \: alkali \: metals }$

Because there oxides are soluble in water and when they react with water forms a strong alkaline solution.