mass number = number of protons + number of neutrons. 47 = 20 + neutrons, so neutrons equal 27.
An atom's atomic number gives us its number of protons. Calcium's atomic number is 20. Thus, calcium has 20 protons, regardless of isotope.
27
20.
iodine has 53 and silver has 47
Several can. Perhaps you meant to ask which has 20 protons, in which case the answer is calcium. (Calcium is also one of the elements that can have 20 neutrons, but it's not the only one.)
isotope of silver
A silver ion.
155 particles 47 protons 47 electrons 61 neutrons
The atomic number of silver is 47. So there are 47 protons
47 protons, 47 electrons and 61 neutrons
Calcium has 20 Protons. You can determine the amount of Protons in an Element by checking the top number of an element. This is called the Atomic number. Calcium has 20 protons
Calcium has 20 protons and Chlorine has 17, so 20+17= 37 protons.
47 protons and 107-47=60 neutrons
carbon has : 36000 protons 124000 electrons 348850 calcium
20.
47
it has 47 protons because the atomic number is the same thing as the number of protons
Calcium (element number 20) has 20 protons and 20 electrons.
Calcium has 20 protons.
Calcium has 20 protons and electrons and a number of neutrons different for each isotope..