Question

1. using the periodic table as a model, which prediction about element w in group 17 is most likely correct? element w will have 7 valence electrons and tend to form w - ions. element w will have 17 valence electrons and form w - ions. element w will have 8 valence electrons and not form ions. element w will have 7 valence electrons and form w+ ions.

Explanation:

Step1: Recall periodic - table trends

Elements in Group 17 are halogens. The group number represents the number of valence electrons for main - group elements. So, elements in Group 17 have 7 valence electrons.

Step2: Analyze ion - formation

Halogens tend to gain 1 electron to achieve a stable octet configuration. When an element gains 1 electron, it forms a negatively - charged ion with a charge of - 1. So, element W in Group 17 will form $W^-$ ions.

Answer:

Element W will have 7 valence electrons and tend to form $W^-$ ions.