Identify the incorrect match
Name IUPAC official name
(a) Unnilunium (i) Mendelevium
(b) Unniltrium (ii) Lawrencium
(c) Unnilhexium (iii) Seaborgium
(d) Unununnium (iv) Darmstadtium

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(a), (i)

(d), (iv)

(c), (iii)

(b), (ii)

answer is C.

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Detailed Solution

According to IUPAC, the name of the element is directly derived from its atomic number, by using the following numerical roots:
0= nil (n), 1= un(u), 2= bi(b), 3= tri(t),
4= qua(q), 5= pent(p), 6= hex(h),
7= sept(s), 8= oct(o), 9 = enn(e).
The numerical roots are put together according to the digits, that make up the atomic number, and adding “ium“ to spell out the name.
Name IUPAC Offi cial Name
Unnilunium(101) – Mendelevium (Md)
Unniltrium (103) – Lawrencium (Lr)
Unnilhexium(106) – Seaborgium (Sr)
Unununnium(111) – Darmstadtium (Rg)
Hence, the correct answer is (D),(iv).

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