Question

A certain element forms an ion with 54 electrons and a charge of -2. Identify the element.

Answer 1

Answer:

Tellurium is a chemical element with the symbol Te and atomic number 52. with charge -2 it gains two more electrons.

Answer 2

• We have been given that the charge on the ion is  -2

      The element has 54 electrons

• As the charge is -2, this means the atom has gained 2 electrons.

        So, the element originally has 54-2= 52 electrons

• This means that the atomic number of the element is 52.

       The atomic number = number of protons

                                        = number  electrons

Atomic number 52 corresponds to tellurium.

The electronic configuration of tellurium is [Kr]4d¹⁰5s²