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
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
How many electrons are in the outer shell of the group 7 elements?
a pale yellow gas
a dense green gas
a dark grey crystalline solid
a dark orange-brown solid
What type of bonds do group 7 elements form?
Ionic and covalent
Metallic and covalent
Hydrogen and metallic
Group 7 elements are also known as…
Halogens exist as molecules made up of pairs of atoms, joined together by covalent bonds. These molecules are known as…
Group 7 elements only form what type of ion?
Halogens all react with metals. How many electrons do they gain when they undergo this type of reaction?
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