Read the given expressions. Effevtive nuclear charge = atomic number - x. Which of the following explains the identity of x and its trends across the period? X is the screening constant, and it increases across a period.
X is the screening constant, and it remains constant across a period.
X is the number of outermost electrons, and it increases across a period.
X is the number of outermost electrons, and it remains constant across a period.