Elementary: Periodic Table is an Open-source app for android, It can be used as a simple reference and provides simple definitions to the elements in the periodic table.
The concept the new design is create a new symbol for the application's icon. A laboratory glass tube with chemicals for chemistry and elements.
The new proposed Icon is simple and it has its has its identity which which represents the applications purpose. Single colors are used in the design for simplicity and the icon can be seen even in small sizes.
Adobe Illustrator CC 2017