A chemist is identifying the elements present in a sample of seawater. What characteristic of an element's atoms always determines the element's identity? Group of answer choices (Could someone help me? I am kind of confused) Thank you so much

A. The number of valence electrons

B. The location of valence electrons

C. The number of neutrons

D. The number of protons

Four statements about the development of the atomic model are shown below. a: electrons have wavelike properties. b: atoms have small, negatively charged particles. c. the center of an atom is a small, dense nucleus. d: atoms are hard, indivisible spheres. which order of statements represents the historical development of the atomic model? c-d-a-b c-d-b-a d— в-а — с d-b-c-a