Science simulation, Probeware, Coding
Freely combine protons, neutrons, and electrons to create your own atom. Notes This simulation only provides tools for building atomic models and does not determine whether the completed atomic model is stable. For every number of … more
This page is the start screen for the Element Symbol Typing Bubble Game. When a teacher creates a game, a QR code for joining and a live scoreboard will be displayed on the screen. Students can … more
Type an element symbol to pop the bubbles. Type one of the element symbols shown on the right. Use the Backspace ⌫ key to delete a mistyped character. The list of element symbols that appear … more
Light has both particle and waves properties at the same time. Likewise, de Broglie (France, 1892 – 1987) thought that such things as electrons that had so far been considered particles might possess wave nature (1932). … more
A solid metal can be made by grouping several hot gaseous (monatomic) metals together. What is the difference between emission spectra in the gas (monatomic) and solid state? The simulation above is a simple example and … more
A cathode ray tube (CRT) is a device that produces cathode rays (a stream of electrons). The inside of the tube is evacuated or filled with a noble gas. When a high voltage is applied to … more
You can create molecular structures by dragging the atoms. Atoms that no more needed can be returned to the periodic table.
Arrange the element cards As Mendeleev did. You can move three or more consecutive cards as a group by dragging the middle. You can view it in full-screen mode by clicking the full-screen button. (There is … more
Discovery of nuclear At the beginning of the 20th century, there was little known about the structure of atoms except that they contained electrons. At that time, the atom was known as a pudding model containing … more
Spectrum of hydrogen At the time of Rutherford’s experiments, chemists analyzed chemical components using spectroscopy, and physicists tried to find what kind of order in complex spectral lines. For example, a hydrogen arc tube containing hydrogen, … more
The discovery process of the atom Democritus (Ancient Greece) – Predict the presence of an atom Dalton (UK, 1800) – Applied atomic chemistry Krux (Britain, late 19th century) – Invented a cathode ray tube to explain … more
Energy band and band gap of atom According to Niels Bohr’s atomic model, electrons subordinate to an atomic nucleus do not have continuous energy. Electrons can only have sparsely defined energies. This is why lines in … more