Fill in the blanks.

Fill in the blanks.
1.      The formula of chloride of metal M is MCl2. The metal M belongs to group 2.
2.      18th group in the periodic table contains elements that are all gases at room temperature.
3.      The arrangement of elements in a group of three is known as ­traids.
4.      The law used by Newlands to arrange elements is known as Newlands’ Octaves.
5.      The element eka – aluminum in Mendeleev’s periodic table is known as Gallium in modern periodic table.
6.      Elements showing properties of both metals and non – metals are known as metalloids.