Question #4ef6e

1 Answer
Nov 26, 2015

A calcium ion is written as #[Ca]^(2+)#.


Calcium atoms tend to lose 2 electrons from its valence shell to have a full shell of 8 electrons. For this reason, calcium's charge is #2^+#. To indicate the loss of 2 electrons, we write it as:


[ ] = indicates that the atom is an ion
Ca = the element
2+ = the charge of calcium after losing 2 electrons

When an atom loses electrons, it has a positive charge.
When an atom gains electrons, it has a negative charge.