Group 2
Cesium
An element key shows you the name of the element, its atomic number, its symbol, and its average atomic mass.
The element that contains 14 protons in its atoms has the atomic number 14. On the Periodic Table, this element is silicon, Si.
No currently known element has an atomic number of 255. If you look at the periodic table, you will see that the element with the highest atomic number is ununoctium, which has atomic number 118.
Atomic Mass, and Symbol.
In a given period, group 18 elements will have the highest atomic number.
Cesium
An element key shows you the name of the element, its atomic number, its symbol, and its average atomic mass.
An element "I.D." is an element's atomic number. An element's atomic number shows how many electrons are in an atom of that element. An element's atomic number also determins their position on the Periodic Table.
The element that contains 14 protons in its atoms has the atomic number 14. On the Periodic Table, this element is silicon, Si.
The Truth? Well, there is no element with that atomic weight. The highest atomic weight is 262.11 Sorry!
No currently known element has an atomic number of 255. If you look at the periodic table, you will see that the element with the highest atomic number is ununoctium, which has atomic number 118.
The element provisionally named ununoctium, believed discovered in 2003, has atomic number 118 in Period 7, column 18, with an atomic weight of 294. Once confirmed, it will be given its permanent element name.
I think it is element Uuu, which has the name unununium.
Atomic Mass, and Symbol.
The atomic number of an Element refers to it's position in The Periodic Table. The first element (Hydrogen - H) has the atomic number 1. The second element (Helium - He) has the atomic number 2. The fifty-second element (Tellurium - Te) has the atomic number 52. And so on.
The element with the highest atomic number is Ununoctium (total quantity that has ever existed: three atoms), and its atomic number is 118. Thulium has an atomic weight of 168.9342.