Answer:
74
Explanation:
we know,
atomic number = number of protons
so,
atomic number = 74
74 as the atomic number is determined by the no. of protons in an element
its b
i took the test
[H_3 O^+] = 1.0 ×10^-13
If we multiply the left side we get, 1e - 13. We add 13 to the right side while subtracting the remaining value from the left side (H3O+) than combine like terms. As you will get pH = 13.00
Answer: Pb(NO3)2
your answer is c. two atoms of oxygen.
