___are non-metals and they react with metals to form hallides
Answers
Answer:
Group 7 - the halogens
The group 7 elements are all reactive non-metals. They react with metals to form metal halides, and with hydrogen to form acidic hydrogen halides. Reactivity decreases down the group
Explanation:
Chemical properties of the halogens
Atoms of group 7 elements all have seven electrons in their outer shell. This means that the halogens all have similar chemical properties.
Reactions with metals
The halogens react with metals to produce salts (the word 'halogen' means 'salt former'). For example, chlorine reacts with sodium:
Sodium + chlorine → sodium chloride
2Na(s) + Cl2(g) → 2NaCl(s)
Sodium and chlorine react vigorously when heated, giving an orange flame and clouds of white sodium chloride.
The halogens become less reactive going down group 7. The table describes what is seen when halogens react with iron wool.
FluorineCold iron wool burns to produce white iron(III) fluoride
ChlorineHot iron wool burns vigorously to produce orange-brown iron(III) chloride
BromineHot iron wool burns quickly to produce red-brown iron(III) bromide
IodineHot iron wool reacts slowly in iodine vapour to produce grey iron(II) iodide
Answer:
the group 7 are non metal and they react with metal form hallides