Year 9 revision - Units 4 and 5 Crossword

Mendeleev left gaps in his Periodic Table because he put the elements in groups with similar what? (8,10)
What did Mendeleev change the order of ? (6,6)
The horizontal rows of elements are called what? (7)
The vertical columns of elements are called what? (6)
The group number is the same as the number of electrons in which shell of an atom? (5)
Metals form ions with which charge? (8)
Do metals lose or gain electrons to get a full outer shell? (4)
Atoms become ........... and unreactive when they form ions with a full outer shell (6)
Two negative ions will do what? (5)
What happens to the reactivity as you go down the Halogens? (9)
What happens to the reactivity as you go down group 1? (9)
When group 1 metals react with water, which gas is produced? (8)
Which group of elements act as catalysts, produce coloured compounds and have ions of different charges? (10,6)
What is the mnemonic for the diatomic molecules? (7)
What is the ion of a halogen called ? (6)
What type of bond forms between a metal and non-metal ? (5)
What is the name of a compound formed between sodium and iodine? (6,6)
What is the formula of sodium fluoride ? (3)
What is the charge on the Fe (II) ion? (3,4)