Atomic structure Flashcards
What is an atom?
The smallest part of an element that can exist
What is a compound?
Two or more elements chemically combined in fixed proportions
What is a mixture?
Two or more elements or compounds not chemically combined
What is filtration?
A process to separate solids and liquids
What is distillation?
A process to separate substances with different boiling points by evaporating and condensing
What is a chemical reaction?
A reaction that involves the formation of new elements or compounds
What happens during a physical reaction?
A substance changes state
What does an atomic number show?
The number of protons in the nucleus of an atom
How are elements arranged in the periodic table?
In order of increasing atomic number
What does the mass number show?
The sum of protons and neutrons in an atom
What is the maximum number of electrons allowed on the first shell?
2
What is the maximum number of electrons allowed on the second shell?
8
What is the maximum number of electrons allowed on the third shell?
8
What charge do protons have?
+1
What charge do neutrons have?
0
What charge do electrons have?
-1
What is the relative mass of a proton?
1
What is the relative mass of a neutron?
1
What is the relative mass of an electron?
0.0005
Name three people, who were involved in the development of the atomic model, in chronological order
JJ Thomson, Ernest Rutherford and Niels Bohr
Who created the plum pudding model?
JJ Thomson
Who created the nuclear model?
Ernest Rutherford
Who created the Bohr model?
Niels Bohr
