Question

which of the following represents a species with 39 protons and 36 electrons? answer: a $k^{+}$ b $y$ c $ca^{2 + }$ d $y^{3+}$ e $ar$

Explanation:

Step1: Determine the charge of the species

The species has 39 protons and 36 electrons. The charge of a species is given by the formula $Charge = Protons - Electrons$. So, $Charge=39 - 36=+ 3$.

Step2: Identify the element with 39 protons

The atomic number of an element is equal to the number of protons. The element with atomic number 39 is Yttrium (Y).

Step3: Match the ion with the correct charge and element

We are looking for a Y - based ion with a + 3 charge, which is $Y^{3+}$.

Answer:

D. $Y^{3+}$