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.
1
2
3
4
5
Check
Across:
2.
carbon has valency ........
3.
The forces between the protons and the neutrons in the nucleus are of special kind called
5.
Z is the symbol of ............
Down:
1.
..................... has atomic number 19
4.
the mass of a particular atom depends on the total number of protons and neutrons present. This number is called the
OK