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.

They decrease, because of the stronger effective nuclear charge.

Explanation:

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

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

here are some of the ways in which chemical and nuclear reactions differ.

explanation: