Atoms Flashcards
(20 cards)
Where in the atom is the Nucleus?
The centre of the atom
What does the Nucleus contain?
Protons and neutrons
What type of charge does the Nucleus have and why?
Positive because of the protons
Where is most of the mass of the atom?
It is concentrated in the Nucleus
How big is the nucleus in comparison to the atom?
Tiny
What do electrons move around in?
Shells
What charge do electrons have?
Negative
What does the size of an electron’s orbit determine?
The size of the atom
What is an electron’s mass
1/2000
Protons are…
Heavy and positively charged
Neutrons are…
Heavy and neutral
Electrons are…
Tiny and negatively charged
What is a proton’s relative mass?
1
What is a proton’s relative charge?
+1
What is a neutron’s relative mass?
1
What is a neutron’s relative charge?
0
What is an electron’s relative mass?
1/2000
What is an electron’s relative charge?
-1
What does an atom’s mass number tell you?
Total of protons and neutrons
What does the Atomic Number tell you?
Number of protons
