Question

question 23 (1 point)
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____________is a noble gas and __________ is a halogen, respectively.

1. ar and i
2. cl and f
3. au and kr
4. br and cl

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Explanation:

Argon (Ar) is a noble - gas in Group 18 of the periodic table. Iodine (I) is a halogen in Group 17. Chlorine (Cl) and Fluorine (F) are both halogens. Gold (Au) is a transition metal and Krypton (Kr) is a noble - gas. Bromine (Br) and Chlorine (Cl) are both halogens. So the pair with a noble gas and a halogen respectively is Ar and I.

Answer:

1. Ar and I