Answer: A and B have the same density
Explanation:
Answer:
I dont know the answer for that question it's hard question isn't it
Answer:
C. 662.60
Explanation:
the mass of Mn is about 54 grams/mol, (multiply that by 2 since there are 2 Mn's).
the mass of Se is about 79 grams/mol, so multiply that by 7
if you add them, you get 662.60 (approxamitly)
The letter that is not appeared in the chemical element is "J"...
It's C, the amount of protons in the nucleus of each atom :)