Answer: oxygen
There is the s,p,d and f blocks, from groups 1-2 that is the s block, 13-18 that’s the p block, 3-12 is the d block and the f would be lanthanide(#57-71) and actinide (#89-103).
Answer:
B
Explanation:
it's on the internet and I just know because I did this before too
The answer is either D or B. hope this helps.
Answer:
a) 
b) 
c) 
Carbon: 
Explanation:
<u>Nitrate</u>
First of all, is important to know that:

a) 10 ppm of nitrate (
) is equal to 
b) The molecular weight of nitrate is 


c) Nitrate has 14 mg of N per 62 mg of NO3

<u>Carbon</u>
Carbonate has 12 mg of C per 60 mg of 
Bicarbonate has 12 mg of C per 61 mg of 

