Development of the Periodic Table
Completion requirements
Pori drwy'r eirfa gan ddefnyddio'r mynegai hwn
Arbennig | A | B | C | CH | D | DD | E | F | FF | G | NG | H | I | L | LL | M | N | O | P | PH | R | RH | S | T | TH | U | W | Y | Y CYFAN
A
Atomic massthe average mass of an atom of an element compared with carbon-12. | |
Atomic numberthe number of protons in the nucleus of an atom. | |
C
Classificationarranging objects into groups based on shared characteristics. | |
E
Eka-a prefix used by Mendeleev meaning "one," indicating an undiscovered element one place below a known element. | |
Electron arrangementthe distribution of electrons around the nucleus of an atom. | |
G
Gallium(Ga) — the element that matched Mendeleev's predicted eka-aluminium. | |
Germanium(Ge) — the element that matched Mendeleev's predicted eka-silicon. | |
Groupa vertical column of elements with similar chemical properties. | |
L
Law of OctavesNewlands' observation that every eighth element had similar | |
M
Metalan element that is typically shiny, conducts heat and electricity, and forms positive ions. | |