The total number of electrons in a neutral calcium atom is:
18
19
20
21
The atomic number of the element calcium is 20. The total number of electrons in calcium is
Atomic number of calcium is 20. Calculate the number of electrons in calcium.
An ion X2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.
The capacity of M shell is 18, then why does M shell of calcium has 8 electrons though it's atomic number is 20