Hydrogen as it has only 1 proton and therefore only an atomic mass of 1...
Answer:
5
Explanation:
Count the digits after the first non zero number, any number after that (even zero) counts.
Hope that helped!!! k
Answer:
Given the activity series of elements, the reaction that will occur is: 2AgNO3 + Ni -----> Ni(NO3)2 + 2Ag
Answer:
The partial pressure of chlorine gas in the mixture is 1.55 atm.
Explanation:
Partial pressure of oxygen gas = 
Partial pressure of nitrogen gas = 
Partial pressure of chlorine gas = 
Total pressure of the mixture of gases = P = 3.30 atm
Using Dalton's law of partial pressure:



The partial pressure of chlorine gas in the mixture is 1.55 atm.
I would say letter D.
A is biology.
Ecology has to do with distribution of animals.