Calcium has 20 protons, 20 neutrons, and 20 electrons. What is the atomic number of calcium?
A. 20
B. 40
C. 60
A. 20
B. 40
C. 60
David Nuttall
Favorite Answer
Count the protons to get the atomic number. So the answer is A: 20. 40 will be the atomic mass in this situation.
?
neutrons= 40-20=20 protons=20 electrons=20 neutrons=atomic mass- atomic number protons= atomic number electrons= same as protons.
Jewlzeh
The answer's 20. The atomic number is the amount of protons in one atom of the element. The atomic number of an element is on the periodic table, too.
Vincent P
It's 20. Atomic number refers to the number of protons in the atom.
one love
40