Questions: What element forms an ion with an electronic configuration of [Kr] and a -2 charge? Element symbol:

Transcript text: What element forms an ion with an electronic configuration of $[\mathrm{Kr}]$ and a -2 charge? element symbol: $\square$

Solution

Solution Steps

Step 1: Determine the neutral atom's electron configuration

To find the element that forms an ion with the given electronic configuration of $[\mathrm{Kr}]$ and a -2 charge, we first need to identify the neutral atom's electron configuration. The configuration $[\mathrm{Kr}]$ corresponds to the electron configuration of krypton, which has 36 electrons.

Step 2: Account for the ion's charge

Since the ion has a -2 charge, it means the neutral atom must have 2 fewer electrons than the ion. Therefore, the neutral atom must have 34 electrons.

Step 3: Identify the element with 34 electrons

An element with 34 electrons is selenium (Se), which is located in Group 16 of the periodic table.