The non metallic element praesent in the minerall cryolite is

The non-metallic element present in the mineral cryolite is,

Which non metalic element is in liquid form.

Name the gaseous non-metallic elements and the solid non-metallic elements.

Examine the elements of the third period and classify them as metals or non-metals. Comment on the metallic and non-metallic character of the third period. Name the most metallic element and non-metallic element of this period.

The most non-metallic element in group 15 is ____.