Chemistry elements

[Rachel Maddiee]

I need help arranging the elements.

[studiot]

11 minutes ago, Rachel Maddiee said:

I need help arranging the elements.

 

Start by counting th numbr of electrons for each one.

This is the same as the numbr of protons which is the same as the atomic number.

So you can then identify each one.

[Rachel Maddiee]

Element B, Element D, Element A, Element C, 
 

Is that correct?

[studiot]

13 hours ago, Rachel Maddiee said:

Element B, Element D, Element A, Element C, 
 

Is that correct?

 

No, not really it is a complicated subjct but provides the opportunity to learn a lot.

 

The size of an atom is given by its atomic radius.

My idea was for you to identify each element from the atomic number and then look up the size in a table of atomic radii like this one.

https://en.wikipedia.org/wiki/Atomic_radii_of_the_elements_(data_page)

 

You can see from the article that there are several different ways to say how large an atom is.

Wiki also says briefly how the variation in size is realted to the periodic table.

A better explanation, with a graph nd pictures apears in the two attachments.

 

 

Note that although my attachments have slightly different values, the order is the same.

 

So would you like to try again and also state which elements you think A, B, C and D correspond to?

Edited December 21, 2019 by studiot

[Rachel Maddiee]

I don’t get it. Find the atomic radius?

[studiot]

1 hour ago, Rachel Maddiee said:

I don’t get it. Find the atomic radius?

 

What does your book say about the size of atoms on page 187 ?

I don't know what that book is.

 

I am trying to help you learn some stuff here.

[Rachel Maddiee]

It’s different compared to the wiki.

I tried it again with the elements and got Element A, Element D, Element B, Element C

[studiot]

 

21 minutes ago, Rachel Maddiee said:

I tried it again with the elements and got Element A, Element D, Element B, Element C

That is correct if you mean smallest to largest.

It is also the order from my data, although some of their numbers are different.

But this exercise is good because it gets you looking at the periodic table to compare things.

This is good practice and helps you get comfortable with it.

For the same reason did you identify the elements A,B C and D ?

This also helps you get comfortable with electron shells, 1, 2 3 and subshells, 1s 2p, 3p etc.

[Rachel Maddiee]

It doesn’t ask me to show my work so how should I write it out?

[studiot]

Here is what I would say.

 

Size order smallest to largest

A  Neon atomic radius 71 picometres

D Nitrogen atomic radius 75 picometres

B Beryllium atomic radius 112 picometres

C Sodium atomic radius 186 picomatres

 

[Rachel Maddiee]

Will those numbers be accurate bc some of them were different in the textbook?

[studiot]

They are the ones listed in your text book page you posted.

Edited December 21, 2019 by studiot