[Solved] Which of the following is NOT a defining element of an intimate relationship? A) mutual influence between partners B) considering the partner unique C) positive feelings toward the partner D) the potential for erotic contact Sr: Strontium, a chemical element with symbol Sr and atomic number 38, known for its bright-red flames in fireworks. Isotope: Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number, but have the same number of protons. Fe: null Isotope: Forms of a specific chemical element distinguished by having identical proton counts yet varying quantities of neutrons within their cores.