An atom of element a has 103 protons. what would the element's atomic number be?

The atomic number of an atom is the number of protons it has, and if the atom is neutral, it will also be the number of electrons. Therefore:

The atom you're talking about has 103 protons, and an atomic number of 103.

Hope it helped,

BioTeacher101

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.