So, you’re probably wondering- what’s new about chemistry??
Nothing. Absolutely nothing. Chemistry is still chemistry, don’t worry about that… but there’s something new that I’m doing!!
You know this blog’s posting content, right? It’s a bio series, then a physics post, followed by a chem post, and then right back into bio.
However, this time, I’m starting something completely different- a chemistry series!! Thank you to @Eliza for this wonderful idea.
*throws confetti everywhere*
Let’s get started!
I’m sure we’ve all come across the Periodic Table before. It was created by a Russian chemist, Dmitri Mendeleev. The February of 1869 would prove to be an eventful month- Dmitri was trying to organize all discovered elements, and that’s when he invented this table. It’s still in use, even centuries later!!
As you can tell, the table is just a way of organizing all the elements we’ve discovered. However, there’s a special arrangement and placing- the elements aren’t just scattered without any pattern. You can understand so much about an element by it’s placing… These patterns are what we’ll be discussing in this chem series!!
Atomic Mass and Number->
Before we delve into the entire table itself, we need to understand all the little numbers and symbols that reside within each individual cell.
As you can see in the above photo, the number on top is Atomic Number, the number below is Atomic Mass, and the letters in between are the element symbol. Symbol I’m sure we can all understand- what of mass and number?
Atomic Mass is also called the nucleon number. Now you’re like, “Wow, that helps so much. Thanks for further confusing me.”
Well… I’m sure we’ve all seen the structure of an atom, right? You know how the electrons whizz around, but the protons and neutrons just sorta clump together to form a nucleus? Nucleon number is basically how many protons and neutrons lie within the nucleus. If there’s say, 2 protons and 2 neutrons [just an example], then the Atomic Mass is 4. Atomic Mass only differs in isotopes!! [More on this later…]
Atomic Number is far easier. It’s just the proton number. Proton number is, as you can guess, the number of protons that the atom possesses. If the atom is, for example, lithium, it’ll have an Atomic Number of 3, meaning there’s 3 protons.
The numbers 7 and 2 are the electron arrangement. You can ignore that, or check out more about it in my other chemistry post.
Periods and Columns->
Periods are the rows, but, for reasons unknown, they’re called periods. I don’t know why. Jog with the blog, all right? [Winks like a psycho].
Wait, you guys. I was wrong. Sorry for the mess up…😳 The periods are called periods because their chemical properties repeat periodically. Thank you VERY much to Gregory Dennison@Don’t Let The Days Go By for informing me about this! Always a good day to learn something new. For further details, read his lovely comment below!!
Columns are… well, groups. Group 1, Group 2, Group 7… You get it. But there’s alot that you can glean about an element based upon which period or column it’s in. If it’s, say, in the 2nd period and 1st group, then you know that it has 2 shells and 1 valence electron.
Now, I’m sure that that sounded like a bunch of gibberish. Breathe easy, I’m gonna explain.
Let’s look at this atom. This, my friends, is a lithium atom. It’s in the 2nd period, 1st column. Now, since it’s in the second period, it’s gonna have two shells. And the valence is one, since it’s in the first column [valence is the number of electrons in the outermost shell.]
Here, look at this magnesium atom:
Can you guess the column and period it belongs to??
That’s it for today!! I know, today was a slightly text-heavy post. Sorry, there was ALOT to explain… Lemme know your guess regarding the above question in the comment section!!