P1 L1 Modelling the atom
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What are elements?
a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei
What are compounds?
chemical substances made up of two or more elements that are chemically bound together in a fixed ratio
Who first came up with the theory of atoms?
Leucippus of Miletus
Which three sub-atomic particles make up atoms?
protons, neutrons and electrons
What are the relative charges of each of these particles?
positive one, zero, and negative one
What is the Atomic Mass of Helium?
4.002602
What is the atomic number of Hydrogen?
1
What is an isotope?
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
What is the symbol for Hydrogen?
H
What is the symbol for Carbon?
C
What is the symbol for Oxygen?
O
What is the symbol for Nitrogen?
N
What is the symbol for Calcium?
Ca
What is the symbol for Phosphorus?
P
What did JJ Thomson do?
He discovered the Electron and the Plum Pudding Model of the atom
When did JJ Thomson discover the electron?
1897
When did JJ Thomson discover the Plum Pudding Model?
1904
Who explained the atom’s structure?
Ernest Rutherford