The periodic table

Question 1

How are elements arranged in the periodic table?

Answer 1

• elements in the same group have the same amount of electrons in their outer shell, giving them similar chemical properties
• elements with similar properties are found in the same group

Question 2

Metals:

Answer 2

• elements that react to form positive ions
• majority of elements are metals
• found to the left and the bottom of the periodic table

Question 3

Non-metals

Answer 3

• elements that to not form positive ions
• found towards right and top of the periodic table

Question 4

Group 1 - alkali metals:

Answer 4

• have a single electron in their outer shell
• react vigorously with water to create an alkaline solution and hydrogen
• react with oxygen to create an oxide
• react with chlordie to form a white precipitate
• the reactivity of the elements increases as you go down the group

Question 5

Group 0 - Noble gases

Answer 5

• have 8 electrons in their outer shell, meaning they have full outer shells (except helium)
• unreactive and do not easily form molecules because they are stable (full outer shell)
• the boiling points increases as you go down the group

Question 6

Group 7 - The halogens

Answer 6

• seven electrons in their outer shell
• non-metals
• exist as molecules made of pairs of atoms
• react with non-metals to form covalent compounds
• react with metals to form ionic compounds where it carries a -1 charge
• melting and boiling point increase as you go down the group
• reactivity decreases as you go down the group