There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

The periodic table captures a subtle ... recur in every 8th element. Lithium, for example, with an atomic number of 3, is a reactive metal — just like sodium (element number 11) and potassium ...

Sodium, like most elements in the periodic table could be said to have a dual personality. On one side it is an essential nutrient for most living things, and yet, due to its reactive nature is also ...

Players read questions about energy levels and score points by picking the correct element as the answer ... The atom with eight protons in its nucleus (atomic number 8) is oxygen. Each energy level ...

The science of sleep and what happens when we don’t get enough But these four elements cannot complete the whole puzzle of ... almost one-quarter of the periodic table and are mainly found ...

In addition, Moseley's laws allow us to calculate very accurately the wave-lengths of the X-ray spectral lines for any element in the periodic table, if those of the elements in its neighbourhood ...

The modern periodic table is based closely on the ideas he used. Cal: And how is it ordered? Mrs Roberts: So, the elements are arranged in order of increasing atomic number. The horizontal rows ...

The modern periodic table is based closely on the ideas he used. Cal: And how is it ordered? Mrs Roberts: So, the elements are arranged in order of increasing atomic number. The horizontal rows ...