Question

you might need: calculator, periodic table
the lewis diagram below represents a thallium ion.
ddot{\text{tl}} ^{n}
what is the value of n in the diagram?
choose 1 answer:
a 3-
b 1-
c 1+
d 3+

Explanation:

Step1: Identify thallium's group

Thallium (Tl) is in group 13 of the periodic table and has 3 valence - electrons.

Step2: Determine ion formation

To achieve a stable electron configuration, thallium loses 3 electrons to form a cation.

Step3: Find the charge of the ion

When thallium loses 3 electrons, it forms a $3 +$ ion. So, $n = 3+$.

Answer:

D. $3+$