crossword
Crossword
Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
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Check
Across:
1.
A positevely charged ion is called an ...............
4.
Atoms of the same element or of different elements can join together to form
5.
oxygen reacted with a large number of elements and formed..................
Down:
2.
A negatively charged ion is called an ...............
3.
............... was the first scientist to use the symbols for elements in a very specific sense
OK