Which of the following always changes from one atom of an element to another atom of a different element?? A- number of electrons
B- charge
C- Number of hydrogens
D- number of outer shell electrons
E- number of protons

Number of protons

Explanation:

A is false because an atom can have a varying number of electrons and still be the same element, just a different isotope of the element

B is false because the charge of the atom only comes into play when two or more atoms are interacting

C is false bc... well. Hydrogen is literally an element.

D is false because the number of outer shell electrons (valence electrons) just determines what group (or column) the element is in on the periodic table

velocity and height

answer: the answer is b