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Bumek [7]
3 years ago
6

Why are the elements fluorine (F) , chlorine (Cl) , and bromine (Br) all found in the same group within the periodic table? A) T

hey all exist as gases at 20°C) . B) They all react with the noble gases. C) They have the same chemical properties. D) They are all non-metals that form 1+ ions.
Chemistry
2 answers:
Sergio039 [100]3 years ago
6 0
Fluorine, Chlorine, Bromine, Iodine and Astatine are representing the family of elements called : halogens.
Halogens:
- all have 7 electrons in their outer shell,
- are very reactive elements,
- form - 1 ions.
Answer: C ) They have same chemical properties. 
ANEK [815]3 years ago
5 0
A  they all exist as gases at 20c
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Explanation:

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2Al+Cr_{2}O_{3}\rightarrow 2Cr+Al_{2}O_{3}....\Delta H=\Delta H_{1}+\Delta H_{2}=-1675.7+1139.7kJ=-536kJ

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