Question

The element of the third period of the periodic table are given below.

Group I II III IV V VI VII

Period 3 Na Mg Al Si P S Cl

a) Which atom is bigger among Na and Mg? Why?

b) Identify the most (i) metallic and (ii) non-metallic element in period 3.

2. Do you observe yellow light in street lamps? What will produce yellow light?

3. What is "Dioptre"?​

Answer 1

Answer:

diopter is unit of power of lens

Answer 2

Answer:

a) Na because size of the atoms decrease along a period as we move from left to right

b) Na is most metallic while Cl is most non metallic