Answer:
Would be letter C
Elements not yet known
A_________________________
D the belguim people atacked using it
Answer: <em>Chlorine and Bromine</em>
Na 2Co3
1*23=23. 2*12=24. 6*16=96
23+24+96=143
(23*100)/143. (24*100)/143. (96*100)/143
=16%. =16.7%. =67.1%
