Question

which of the following are true regarding this elements electron dot structure? select two correct answers. clear all this element is in period three on the periodic table. this element has three valence electrons. this element comes from a group that is stable. this is a group 17 element. this is a group 13 element.

Explanation:

The number of valence electrons can be determined by the group number (for main - group elements). Group 13 elements have 3 valence electrons. Period number indicates the energy level of the outermost electrons. Elements in period 3 have their outermost electrons in the third energy level. Group 17 elements (halogens) have 7 valence electrons and stable groups usually refer to noble gases (Group 18).

Answer:

This element has three valence electrons.
This element is in period three on the periodic table.