Reef Chemistry Question of the Day #222 Calcium is to Magnesium as...

[Randy Holmes-Farley]

Reef Chemistry Question of the Day #222

What the heck, let's do another one of these with some of our favorite elements.

Calcium is to magnesium as...

A. Sodium is to potassium
B. Oxygen is to sulfur
C. Chlorine is to bromine
D. Potassium is to sodium

Good luck!










































.

 

[beaslbob]

d

 

[Mal11224]

I say A.

 

[Klwheat]

D

 

[MnFish1]

D

 

[JimWelsh]

What a wonderfully Mendeleevian question!

 

[Martin Kuhn]

D

 

[Randy Holmes-Farley]

What a wonderfully Mendeleevian question!

Quite.

 

[Randy Holmes-Farley]

And the answer is...

Calcium is to magnesium as...

D. Potassium is to sodium

Calcium is very chemically similar to magnesium, but larger. Same for potassium being very similar to sodium, but larger.

In the periodic tale of the elements, one can see this clearly, with each pair being in the same column (meaning they are chemically similar) and the first one just below the second (meaning it is larger):

https://sciencenotes.org/wp-content/uploads/2016/07/ShinyPeriodicTable-1024x576.png

 

[TbyZ]

C

 

[TbyZ]

C

Opps

 

[Randy Holmes-Farley]

lol