Question

As you move from left to right across a period, what happens to the atomic radii?

They increase, because of the higher number of occupied energy levels.
They increase, because of the weaker attraction of electrons to the nucleus.
They decrease, because of the stronger effective nuclear charge.
They decrease, because of the increased atomic mass.

Answer 1

Answer: They decrease, because of the stronger effective nuclear charge (C)

Answer 2

They decrease, because of the stronger effective nuclear charge.

Step-by-step explanation:

• Atomic radii decreases from left to right across a period.

• This is due to the increase in the no. of protons and electrons through the period.

• One proton has a greater effect than one electron.

• So, electrons are attracted towards the nucleus and resulting in a smaller atomic radii.

Thus, the right choice is: They decrease, because of the stronger effective nuclear charge.