Why do Group 1 and 7 elements react together?
State the trends in reactivity of the group 1 and group 7 elements and explain the reasons why.
Elements react by gaining or losing electrons.
Group 7 elements however have 7 electrons in their outermost shells, so they react by gaining an electron to form an outermost ring of 8 electrons..
What is the reactivity of Group 1 and Group 7 elements?
The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group. This is the opposite trend to that seen in the alkali metals in Group 1 of the periodic table . Fluorine is the most reactive element of all in Group 7.
What happens when a group 1 element reacts?
When an element in group 1 takes part in a reaction, its atoms lose their outer electron and form positively charged ions , called cations . The more easily these cations form, the more reactive the metal.
How do group 1 elements react with halogens?
Group 1: The Alkali Metals All the alkali metals react vigorously with halogens to produce salts, the most industrially important of which are NaCl and KCl. Sodium Chloride is used as a preservative for meat and to melt the ice on the roads (via freezing point depression).
Is Group 1 or Group 7 more reactive?
As you go down group 1 (the alkali metals) in the periodic table, the elements get more reactive. As you go up group 7 (the halogens), again the elements get more reactive.
Why does Group 7 get less reactive?
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.