mass number = protons + neutrons. Name the first 20 elements. The first 20 elements of the periodic table are as follows: H – Hydrogen, He – Helium, Li – Lithium, Be – Beryllium ...

117 and 118 had been added to the list. This now completes the 7th period of the periodic table of elements. Related: Missing element from periodic table finally created, scientists say “The ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

Unlike the even, square periodic table of old, the skewed, multicoloured table of 2019 shows many of the elements used to make mobile phones as being included on an ‘endangered list’.

By Siobhan Roberts When Sir Martyn Poliakoff, a chemist at the University of Nottingham, heard about a game called Periodic Table ... a list of the atomic weights of the known elements, along ...

The periodic table ... elements in combination, having properties quite distinct from their component elements. By the early 19th century, there was good circumstantial evidence for the existence of ...

Numbers 114 and 116 will sit "down in the lower-right corner of the periodic table." In real life ... body that is the keeper of the list of elements." The union has "finicky rules about what ...

Naturally occurring superheavy elements beyond those listed in the periodic table could potentially explain why asteroid 33 Polyhymnia is so dense, new research suggests. A handful of asteroids in ...