Question

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

Explanation:

• Valence electrons: In a Lewis dot structure, the number of dots represents the number of valence electrons. Here, there are three dots, so the element has three valence electrons.
• Group number: The group number of an element in the periodic table (for main - group elements) is related to the number of valence electrons. For elements with \(n\) valence electrons (\(n = 1 - 8\)), the group number is \(n+ 10\) (when \(n

eq1\)). Since there are three valence electrons, the group number is \(13\) (because \(3 + 10=13\)).

Answer:

• This element has three valence electrons.
• This is a group 13 element.