Atomic Structure Flashcards
What is an atom?
2
The fundamental piece of matter
And the basic unit
What one thing isn’t made of atoms?
Energy
Otherwise everything is ,add of atoms
What does basic unit mean?
The smallest particle of a chemical element
What is Thompson’s plum pudding model?
A positively charged sphere with negatively charge electrons
What is Rutherford’s atomic model?
A positively charge nucleus in the centre with negatively charged electrons orbiting it
What is Bohr’s atomic model?
The one we use today
What is the nucleus?
3
The centre of the atom
Tiny
Dense
What does the nucleus contain?
2
Protons
Neutrons
What is the collective name for protons and neutrons?
Nucleons
What do electrons do?
Orbit the nucleus in shells
Do electrons impact the mass of the atom?
No
It doesn’t contribute much to the mass of the atom
What is the relative mass of protons?
1.0
What is the relative mass of neutrons?
1.0
What is the relative mass of electrons?
1/1836
What is the relative charge of protons?
+1
What is the relative charge of neutrons?
0
What is the relative charge of electrons?
-1
What are protons equal to?
Electrons
What is the mass number?
The number of nucleons
Protons and neutrons
What is the atomic number?
The number of protons
How do you know which is the mass number and which is the atomic number?
The mass number will be the bigger number
How is the periodic table ordered?
By atomic number
How to you figure out the number of electrons?
It’s the same as protons so look at the atomic number
