Identify the element: a made-up symbol X

An example figure from the Nuclide Notation generator.

A nuclide symbol with the made-up symbol X: mass number 79, atomic number 34 and a 2− charge, with an answer key under it — A nuclide symbol with the element hidden behind the letter X, for an “identify the element” question: mass number 79, atomic number 34 and a 2− charge. Students find the element with 34 protons and work out its neutrons and electrons, which the answer key under it gives.

Edit this figure Download PNG

Editing opens it in Nuclide Notation with these settings, to change anything and copy or download your own.

Answer key

X is selenium-79 ion, Se²⁻
34 protons, 45 neutrons, 36 electrons

Free to use in your tests, worksheets, slides or anything else, no credit needed. Public domain under CC0 1.0. How to reuse our figures

More Nuclide Notation examples

Make your own in Nuclide Notation →