Consider the following elements in their stable forms: 1. Oxygen 2. Xenon 3. Chlorine 4. Bromine Then for each of the following questions, enter the cumber listed ( 14) before the element, for elements that aatiff the criterion. Enler the numberin) in onder with no separators. If none, type "bone" or lesvo blank (a) Which of these elements have allotropes? (b) Which of these elements exist as diatomic molecules? (c) Which of these elements exist as a metallic lattice