Question

Which is bigger and why? a Li or Na b.Be or B​

Answer 1

Answer:

Na

Step-by-step explanation:

Moving from left to right along a period leads to decrease in size of atomic radius. Moving down a group from top to bottom leads to increase in size. Among the given species, Na is the largest.

Answer 2

a. Na

b. Be

Step-by-step explanation:

• The reason why Na (Sodium) is bigger is because it has a greater atomic radius when compared to Li (Lithium) and it has one more energy level compared to Li (Lithium). Na (Sodium) also has more shielding when compared to Li (Lithium).
• The reason why Be (Beryllium) is bigger is because it has a greater atomic radius when compared to B (Boron). It also has a higher ionisation enthalpy.