Wilkins and Franklin studied the structure of DNA using , a technique to examine molecules, and helped Watson and Crick determined that the shape of the molecule was a

X-rays

double helix

the form of energy changes and the total energy increases0l

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called