Question

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• select the element that is not a halogen:

ts/at/i/ br/rg/cl/f
a) rg
b) ts
c) at
d) not here
e) br

Explanation:

Step1: Recall halogen group elements

Halogens are in Group 17 of the periodic table. Elements like F (Fluorine), Cl (Chlorine), Br (Bromine), I (Iodine), At (Astatine), Ts (Tennessine) are halogens. Rg (Roentgenium) is a transition metal (Group 11), not a halogen.

Step2: Identify non - halogen

Among the options, Rg (Roentgenium) is not a halogen. So option a is the correct one.

Answer:

a) Rg