Periodic Classification of Elements
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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2
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4
Check
Across:
1.
average mass of atoms of an element
3.
Horizontal rows in the periodic table
4.
vertical column in the periodic table
Down:
1.
mass of a single atom of a chemical element
2.
a substance whose atoms all have the same number of protons
OK