The “lead” of a pencil is actually made of a substance called graphite which is made of carbon atoms. The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and ...

Students look more deeply into the structure of the atom and play a game to better understand the relationship between protons, neutrons, electrons, and energy levels in atoms and their location in ...

and it is the amount of protons that determine the energy of the X-rays. After years of searching, at last we had a periodic table that really worked, and the fact that we still use it today is ...

The atomic number of tellurium is 52 and the atomic number of iodine is 53, so these elements are in the correct order in the modern periodic table.

This was the first version of what would come to be known as the modern periodic table, now composed of 118 elements arranged in 18 groups (columns), and 7 periods (rows). Today, the elements are ...

SUNAYANA: I also like to think of the atomic number as the address of an element – it tells you how many protons are in the nucleus and also its position in the periodic table. That's what makes ...

The periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, ...

If it has 7 protons, that’s nitrogen. But the logic of the periodic table also relies upon the number and organisation of electrons in an atom. Let’s take chlorine as an example. It is ...

More than 40 years later, it was suggested that each element has a unique numbered position in the periodic table, known as its atomic number. Physicist Henry Moseley proved the existence of the ...