7.1 INSIDE ATOMS Flashcards
Scientists modelled atoms as…
solid sphere
What is model?
An idea that explains observations and helps in making predictions
Which phenomenons can solid sphere (model) explain?
Condensing
Melting
Chemical reaction
Condensing
Melting
What is analogy?
(Hint: Pool balls)
Atoms are like pool balls. They are solid spheres. When they hit each other, they change directions.
Why are analogies useful?
Helps to explain things that are small, or very big
What are the three types of subatomic particle?
Proton
Neutron
Electron
What subatomic particles does a Nucleus have?
Proton and Neutron
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?
1/2000
What is the relative charge of a proton?
+1
What is the relative charge of a neutron?
0
What is the relative charge of an electron?
-1
Why do atoms have no electric charge?
Atoms have no electric charge because they have an equal number of protons and electrons.
Electrons = negatively charged
Nucleus = positively charged due to protons
Why are atoms neutral?
Atoms are neutral because they have an equal number of positively charged protons and negatively charged electrons. The charges balance out, making the atom overall neutral.
How is an individual atom held together?
An individual atom is held together by the electrostatic attraction between its positively charged nucleus and its negatively charged electrons.
What holds an atom together?
The negatively charged electron is attracted to the positively charged nucleus because of the electromagnetic force. It’s like a magnetic pull that holds the atom together.
