Question

Which of the following is true of groups on the periodic table? A. Groups are horizontal and do not have the same properties. B. Groups are vertical and do not have the same properties. C. Groups are horizontal and have the same properties D. Groups are vertical and have the same properties.

Answer 1

Groups are vertical, numbered 1 through 18, and have similar properties, so answer D. Most of the properties of groups are defined by the outermost electron in the shells of the elements. Horizontal delineations in the Periodic Table are known as periods.