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Periodic Table - Group 7 Elements
Reactivity of the elements in group 7 decreases down the group. This is because the electrons in the outer shell are further away from the nucleus.

Periodic Table - Group 7 Elements

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In high school Chemistry students must have a good knowledge of the periodic table. Most UK exam boards still follow the convention that the number of electrons in the outer shell = number of group. Since most schools teach to that convention, we use it in our quizzes. If you study chemistry to higher levels, you will find that this is no longer the case other than for groups 1 and 2.

How many electrons are in the outer shell of the group 7 elements?
At high school, the group number gives you the number of outer electrons
Choose the correct order from top to bottom of group 7.
F, Br, I, At, Cl
At, I, Br, Cl, F
F, Cl, Br, I, At
Br, Cl, I, At, F
It is useful to remember this order of elements as it the patterns of chemical and physical properties of group 7 usually refer to all or part of it
What type of bonds do group 7 elements form?
Ionic and covalent
Covalent only
Metallic and covalent
Hydrogen and metallic
They form ionic bonds with metals but can also form covalently bonded molecules with other non-metals
Bromine displaces iodine from solution because...
Iodine is more reactive than bromine
Bromine is more reactive than iodine
Bromine is a smaller atom
Iodine has more electrons than bromine
Reactivity of the halogens decreases down the group
Group 7 elements are also known as...
Alkali metals
Transition elements
Noble gasses
From the ancient Greek - halos (salt) and gen (producer)
Halogens all react with metals. How many electrons do they gain when they undergo this type of reaction?
This gives them the stable electron configuration of the nearest noble gas
Group 7 elements only form what type of ion?
They all gain one electron to fill their outermost electron shell
Iodine is...
a pale yellow gas
a dense green gas
a dark gray crystalline solid
a dark orange-brown solid
Iodine is poisonous and produces a violet colored vapor when heated
Reactivity of the elements in group 7 decreases down the group. This is because...
There are more electrons in the outer shell
The electrons in the outer shell are further away from the nucleus
The electrons are closer to the nucleus
There are more electrons in the atom
The halogens react by attracting electrons from other atoms into the outer shell. As you descend the group, the atoms have more shells. These shield incoming electrons from the attractive force of the nucleus making it more difficult for the atoms to react
Halogens exist as molecules made up of pairs of atoms, joined together by covalent bonds. These molecules are known as...
Di = two and atomic = atoms
Author:  Kate Gardiner

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