Atoms and the Periodic Table Crossword Puzzle
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QUESTIONS LIST:
- nucleus : part of the atom comprising protons and neutrons (7)
- oxidation : process that causes reactive metals to discolour in air (9)
- mass : protons and neutrons have a relative _ of 1 (4)
- boron : the only non-metal group 3 element (5)
- chemical symbol : h is the _ of hydrogen (8,6)
- argon : gas used to stop cs and rb from oxidising in storage (5)
- lithium : metal harder than sodium and in the same group (7)
- positive : protons have a _ charge (8)
- sodium : na is the chemical symbol for _ (6)
- fluorine : non-metal with a mass number of 19 (8)
- electrons : negatively-charged sub-atomic particles (9)
