Advice for creating a clean table with tabularray

I am trying to recreate (and improve if possible) this table that I made in Microsoft Word. See the image:

I think the tabularray package is the best option. Here is MWE example that I built.

Can someone please advise with my limited knowledge of tables in LaTeX that I'm on the correct lines here?

Thank you.

I suggest to:

use fixed width columns for columns 2-5 and an X column for the first column. This way, tabularray can add line breaks to your texts and also adjust the width of the whole table to match your text width

instead of manually trying to move the entries around by adding ~, I'd suggest centred columns for columns 2 to 5

use siunitx to properly format your units

some other minor changes, see the code below:



I'd put the two different measurements into separate rows, also I'd get rid of all except 3 of the horizontal rules. I'd also drop the parentheses around the second measurement of each group. You can highlight the next two lines belonging to the subheading one by indentation (you might also drop the bold font for the head row in this):



Alternatively you can use a bold font and drop the indentation:



Here are a couple of options I suggest. My goal with tables is always to minimize repetition and make them as clear and straightforward as possible.





An alternative tblr of tabularray package table. I would use X columns type and package mchem chem formulae for hydrogen: