How does the reactivity of group 7 change?
Reactivity decreases down the group. This is because group 7 elements react by gaining an electron. As you move down the group, the amount of electron shielding increases, meaning that the electron is less attracted to the nucleus.
What are the reactions of group 7 elements?
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….Reactions with metals.
| Halogen | Reaction |
|---|---|
| Chlorine | Hot iron wool burns vigorously to produce orange-brown iron(III) chloride |
What is the trend in reactivity of group 7 elements?
The reactivity of Group 7 elements decreases down the group. Non-metal atoms gain electrons when they react with metals. When a halogen atom reacts, it gains one electron into their highest occupied energy level (outer shell) to form a singly negative charged ion.
Why do group 7 elements form changes?
The group 7 elements want to gain one more electron so that they have a stable electronic structure. The smaller the atom, the easier it is to grab an electron from another atom, making the atom more reactive. As you go down group 7, the atomic radius increases and it becomes more difficult to attract another electron.
What happens when group 7 elements react with metals?
The Group 7 elements are called the halogens. Group 7 elements form salts when they react with metals. The term ‘halogen’ means ‘salt former’.
What happens when elements from group 7 gain electrons?
When an element in group 7 takes part in a reaction, its atom’s outer shells gain an electron and form negatively charged ions , called anions .
What happens when Group 7 elements react with metals?
What are Group 7 elements called?
the halogens
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Why are group 7 elements gases at room temperature?
The group 7 elements exist as diatomic molecules . The bond between the atoms in a molecule is very strong, but the forces of attraction between molecules are weak. This explains why group 7 elements have low boiling points.
Why do Group 1 and group 7 elements react together?
Halogens from bromide to fluorine get more reactive because the force of attraction between the nucleus (core) and the outer electron get stronger as you go up group 7 elements. As you go down group 1 (the alkali metals) in the periodic table, the elements get more reactive.
Are group 7 elements gases?
Chlorine, bromine and iodine are the three common Group 7 elements. Group 7 elements form salts when they react with metals….Properties and uses of the halogens.
| Element | Properties | Typical use |
|---|---|---|
| Chlorine | Green gas | Sterilising water |
| Bromine | Orange liquid | Making pesticides and plastics |
| Iodine | Grey solid | Sterilising wounds |