Question 12 of 25 Which sentence describes all atoms of one element?
O A. They have the same number of protons.
OB. They have the same number of neutrons.
O C. They have the same number of isotopes.
D. They have the same properties.

D They have the same properties.

Explanation:

The same no. of isotopes doesnot describes because isotopes have same symbol but didderent atomic mass.

1.solid

2.carbon dioxide

3.helium

the ratio of the conjugate base to the acid required to attain the desired ph.