What are the names of the elements present in Methane?
(a) What are metalloids? Name two metalloids.
(b) Classify the following elements into metals,non-metals, and metalloids:
Copper, Sulphur, Aluminium, Oxygen, Silicon, Nitrogen, Germanium, Mercury, Chlorine, and Sodium.
Besides sulphur and chlorine, which other non-metallic element is present in the third period?