C1: Atomic Structure Flashcards
How are compounds formed?
From elements by chemical reactions
What did the discovery of the electron lead to?
The plum pudding model
What did the plum pudding model state?
The atom is a small ball of positive charge with negative electrons embedded
What 2 things did the results from the alpha scattering experiment lead to?
The mass as concentrated at the centre (a nucleus) and that the nucleus was charged
Who adapted the nuclear model? (a.k.a the alpha scattering experiment)
Niels Bohr
How was the nuclear model adapted?
The suggestion that electrons orbited the nucleus at specific distances
What did James Chadwick do?
Discover neutrons
What is an elements atomic number?
The number of protons
What is the radius of an atom?
0.1nm
What is the radius of a nucleus?
1/10,000 of that atom
Where is almost all of the mass of an atom be?
The nucleus
What is the mass number?
The sum of an atom’s protons and neutrons
What is the mass number?
The sum of an atom’s protons and neutron
What is the relative atomic mass of an atom?
The average value that takes account of the abundance of the isotopes of the element
What does the size of an atom depend on?
The element that it is