As I mentioned previously the United Nations General Assembly during its 74th Plenary Meeting proclaimed 2019 as the International Year of the Periodic Table of Chemical Elements (IYPT 2019) on 20 December 2017. The IYPT website gives details of events and you can find out more by looking for the hashtag #IYPT2019.

As you might expect this has lead to the development of the number of Periodic Table apps and I've highlighted a couple of mobile apps previously.

I've just been told of another app.

Chemistry & Elements is available on the AppStore.

Convenient interactive Mendeleev's Periodic table. Tap a chemical element in the table to find more information about it. The calculator of molar masses. Enter a chemical compound correctly and it will show molar masses and percentages of elements. The table of solubility of substances is added in the app as well as Acid strength chart. Now your textbooks become waste!

All these tables and charts are available in the app for free:

• Periodic table
• Offline access to information about chemical elements
• Solubility table
• Molar mass calculator
• Electronegativity of elements
• Molecular weights of organic substances
• Reactivity series
• Acid strengths chart