An ionised metal species, yM3+^{y}\text{M}^{3+}yM3+, is identified in the emission spectrum of a hot stellar atmosphere. The ion contains exactly 30 neutrons in its nucleus, and the total number of its fundamental particles (protons, neutrons, and electrons) is 81.
Which of the following correctly identifies the metal M\text{M}M and its mass number yyy?
M=Iron (Fe),y=56\text{M} = \text{Iron (Fe)}, y = 56M=Iron (Fe),y=56
M=Cobalt (Co),y=57\text{M} = \text{Cobalt (Co)}, y = 57M=Cobalt (Co),y=57
M=Chromium (Cr),y=54\text{M} = \text{Chromium (Cr)}, y = 54M=Chromium (Cr),y=54
M=Nickel (Ni),y=58\text{M} = \text{Nickel (Ni)}, y = 58M=Nickel (Ni),y=58
33 exam-style questions on AQA A Level Chemistry Atomic structure, covering Fundamental particles, Mass number and isotopes, and Electron configuration. Each one has a worked solution and a mark scheme showing where the marks go.