2. __________ possesses the properties of both alkali metals and halogens. a) Helium b) Hydrogen c) Sodium d) Chlorine
Answer: b Explanation: Because hydrogen’s outer shell configuration (that is 1s1) contains only one electron in the s-orbital, it qualifies as an Alkali metal. A noble gas structure, which is a feature of halogen, can be obtained with only one electron.
