(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.
Which of the following elements is a metalloid ?
(a) sodium
(b) sulphur
(c) silicon
(d) silver
Silicon forms a compound with chlorine in which 5.6 gm of silicon is combined with 21.3gm of chlorine. Calculate the empirical formula of the compound. (At mass of si -28 cl - 35.5)