Atomic Structure - Unit 1 Topic 2 Flashcards
Who’s theory in 1808 proposed ‘all elements are made of small indivisible particles called atoms’
John Dalton
Who discovered the electron? What was his model called?
J.J. Thomson Plum pudding model
Who discovered the neutron?
James Chadwick
Who discovered the proton?
E. Rutherford
What is the mass, charge & position of protons, neutrons and electrons?
Proton - 1 —- +1 —- nucleus Neutron - 1 —- 0 —- nucleus Electron - 1/1840 —– -1 —- shells
What is the maximum electronic structure?
2,8,8,8
What is atomic number?
Number of protons/electrons.
What is mass number?
Number of protons + neutrons.
What are isotopes?
Atoms of an element with same atomic number but different mass number. Different number of neutrons.
In terms of ions: What is an atom? What is a positively charged atom? What is a negatively charged atom?
Ion Cation Anion
What ions do metals form? What ions do non-metals form?
Positive ions Negative ions
What part of an atom changes in ions? What happens to the outer shells?
Electrons. They become filled.
If an atom has had 1 electron removed, is it positively or negatively charged? What if it had 1 added?
Positively Negatively
Who proposed that matter was made of 4 elements. ‘Air, fire, Earth & water’?
Aristotle
Draw a lithium ion
Draw a hydrogen ion
