3. A transform boundary is A. When two boundary plates are moving slowly toward each other.
B. When two plates are moving away from each other.
C. When two plates are moving sideways past each other.
D. When two plates cause a chain of islands.

Henry moseley used x-ray experiments to determine the atomic number of elements. how did his discovery contribute to the development of the periodic table? a. it confirmed that elements should be arranged in strict order of increasing atomic mass. b. it led to elements with similar atomic numbers being grouped together. c. it allowed the elements to be placed in strict order of increasing atomic number. d. it showed that the way mendeleev grouped elements together was completely wrong.