7. Wind, moving water, falling rocks, and roller-skating children are all examples of -

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.

Acontrol during an experiment. might change remains constant does not exist does change

Will mark brainliest how many electrons can be held in the energy level n = 4?