Give the symbol of the element that has the
b. largest atomic size in Period 4

Question

Give the symbol of the element that has the

b. largest atomic size in Period 4

Accepted Answer

Welcome back, everyone. We need to identify the period three element with the smallest atomic size from the following elements. In choice A we have sodium. In choice B we have argon. In choice B we have boron. Sorry. In choice C we have boron. And in choice D we have krypton. Let's begin by recalling our trend on our periodic table for increasing atomic radius. On our periodic table, we should recall that atomic radius describes the distance between the nucleus of our atom at its core to its outer valence shell where our outermost electrons for the atom are located. And on the periodic table, it increases towards the bottom left of our periodic table. So we're going to need to focus on the position of our given a atoms and our answer choices beginning with choice. A sodium recall that sodium is located across period three and recall that our period numbers are the rows going horizontally across our periodic table. and sodium is located in group one A and so we would find sodium at again period three group one A. So this position on our periodic table and based on our trend of atomic radius sodium would correspond to a fairly high atomic radius since it's further to the left of our periodic table and is lower being across period three. So we're going to probably want to rule out choice A. But let's continue and keep comparing for choice B, we have our atom argon recall that argon is located in group eight A, our noble gas group being one of our noble gasses and is also located across period three of our periodic table. And based on our trend for atomic radius being more towards the right of our periodic table, argon would correspond to a much lower atomic radius than sodium. So, so far, we would say that argon has a lower Tomi radius than sodium. Next, we have choice C since we're not going to rule out choice B, let's continue to choice C and choice C is boron. Recall that on our product table, boron is located in group three A which is in our P block just like group eight A where argon is of our periodic table. And we would find boron across period two. So at that position, and because we see that boron is a period two element, we would instantly rule out choice C because boron is again, not in period three, it's a period two element. And our answer should be a period three element. So now we have choice D which is krypton recall that on our periodic table, we would find krypton also in our noble gas group. But this time across period four, so krypton is going to be beneath argon in group eight A our noble gas group. So because krypton is a period four element, we would rule out choice D so as we stated, as far as atomic radius, our sodium would have a larger atomic radius. So we ruled choice A out and this leaves us with choice B as our only correct choice with our element Argon being the period three element with the smallest atomic size from the following elements. And so B is our final answer for argon. I hope that this made sense and let us know if you have any questions.

Give the symbol of the element that has the
b. largest atomic size in Period 4

Verified video answer for a similar problem:

Key Concepts

Atomic Size

Periodic Table Trends

Group vs. Period

Give the symbol of the element that has theb. largest atomic size in Period 4

Verified video answer for a similar problem:

Key Concepts

Atomic Size

Periodic Table Trends

Group vs. Period

Give the symbol of the element that has the
b. largest atomic size in Period 4