The metal ion in an ionic compound will loose an electron becoming a cation. It will therefore develop a positive charge. The magnitude of the charge depends on the number of electrons lost. If one electron is lost the ion gains a +1 charge and of 2 is lost it gains a +2 charge ect.
It was first proposed by J. J. Thomson in 1904.
Hormones which are chemical produced in the body.The hormones are like chemical messages which send a message to the ovaries.the ovaries release hormones which work together hence starting puberty