Question

part d: transition metals – thinking with roman numerals

1. write the symbol and charge for each ion.

• iron (iii) _______________
• copper (i) _______________
• nickel (ii) _______________

part e: extra credit problem

1. an ion has 16 protons and 18 electrons.

a) what element is it? _______________
b) what is the ion’s charge? ____________
c) is it a cation or anion? ____________
d) what noble gas electron configuration does it match? _______________

Explanation:

Part D:

Iron (III)

Step1: Identify element symbol

Iron has the symbol Fe.

Step2: Determine charge from Roman numeral

Roman numeral III means a +3 charge.

Step1: Identify element symbol

Copper has the symbol Cu.

Step2: Determine charge from Roman numeral

Roman numeral I means a +1 charge.

Step1: Identify element symbol

Nickel has the symbol Ni.

Step2: Determine charge from Roman numeral

Roman numeral II means a +2 charge.

Answer:

$\boldsymbol{Fe^{3+}}$

Copper (I)