Rules

The Periodic Table is made up of 118 elements. The objective is to complete the table by running at 118 different locations which match this criteria:

The first letter of the element symbol needs to match the first letter of the location name; and the second letter of the element symbol can appear anywhere else in the location name.

E.g. Bushy Park will match to B, Ba, Bh, Bk and Br. There are almost 200 locations which match to B.

There is just 1 eXception - Xe (Xenon) - there are currently no locations starting with X, therefore a location containing an x (and an e anywhere after the x) in the location name is acceptable e.g. Bexley

Letters not within the UK alphabet (or those with accents) won’t match e.g. Zalew Wrzesiński won’t match to Zn but it will match to Zr.

Instructions

1. Open a web browser and go to https://www.parkrun.org.uk/parkrunner/XXXXXXX/all/ (replacing the X's with your Athlete ID, without the 'A')

2a. If you have the Running Challenges Chrome Extension installed, drag the mouse over the Tourism section to highlight all of the locations you have completed and then press Ctrl-C
2b. If you don't have the Chrome Extension installed, drag the mouse over the All Results section to highlight all of the locations you have completed and then press Ctrl-C

3. Paste the results into Box A on the right

4. Type your Athlete ID into Box B on the right

5. Type your Name into Box C on the right

6. Press the button labelled Generate Periodic Table to see your progress in this challenge

Tips to complete the challenge

To find out which locations meet the criteria for each element, the easiest way is to use the 5k app. From the menu, choose ‘Parkruns’ then ‘FIND A PARKRUN’ then use the filter (top right). Add a filter for ‘Location name starts with’ then another filter for ‘Location name contains’. The map will then update, showing all the possibilities.

Locations often meet the criteria for many elements (though they can’t be used more than once). Locations are automatically assigned to elements, though it’s possible to run at a location which matches a completed element; and the existing location will then be automatically assigned to an uncompleted element if there’s one that matches, e.g. if Ne has been completed by running at Newbury and if Nb is uncompleted, you could run at Newport - Ne would then be completed by Newport and Nb would be completed by Newbury.