Question

the lewis diagram below represents a thallium ion.
tl with two dots above, in bracketsⁿ
what is the value of n in the diagram?
choose 1 answer.
a 3−
b 1−
c 1+
d 3+

Explanation:

Step1: Recall thallium's valence electrons

Thallium (Tl) is in group 13 of the periodic table. Atoms in group 13 have 3 valence electrons. In the Lewis diagram, the thallium ion has a complete octet (or stable electron configuration, here it seems to have lost its valence electrons or has a stable configuration).

Step2: Determine the charge

Thallium, to achieve a stable electron configuration (like a noble gas), often loses 3 electrons. When an atom loses electrons, it forms a positive ion. The number of electrons lost is equal to the positive charge. So if Tl loses 3 electrons, the charge \( n \) should be \( 3+ \). Also, looking at the Lewis structure, the ion is represented with a positive charge corresponding to losing 3 electrons (since group 13 metals typically form \( 3+ \) ions).

Answer:

D. \( 3+ \)