Please help this is due tomorrow

Read the given expression. x = number of protons − number of core electrons which of the following explains the identity of x and its trends across a period? x is the effective nuclear charge, and it remains constant across a period. x is the screening constant, and it remains constant across a period. x is the effective nuclear charge, and it increases across a period. x is the screening constant, and it increases across a period.

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?