The atomic number of calcium is 20.So its electronic configuration is 2,8,8,2.
Definition of electronic configuration
The arrangement of electrons in various energy levels of an element is called electronic configuration.
According to the Bohr and Bury scheme,
The maximum number of electrons which can be accommodated in any shell of an atom is given by 2n2.
The electronic configuration of calcium is 2,8,8,2.
Therefore the given statement is true.ie., the atomic number of calcium is 20.So its electronic configuration is 2,8,8,2.