The Atom Flashcards
What are the three subatomic particles that make up an atom?
Protons, neutrons, and electrons
What is the charge of protons?
Positively charged
What is the charge of neutrons?
Neutral
What is the charge of electrons?
Negatively charged
Which subatomic particle has the smallest relative mass?
Electrons
What is the relative mass of protons or neutrons?
1
Where is the nucleus located in an atom?
In the middle of the atom
What does the nucleus contain?
Protons and neutrons
What charge does the nucleus have?
Positive charge
What is the atomic radius of an atom approximately?
10^-10 m
What determines the size of the atom?
The size of the electron shells
What makes an atom neutral?
The number of protons equals the number of electrons
What is an ion?
An atom or group of atoms that has lost or gained electrons
What does the atomic number represent?
The number of protons in an atom
What does the mass number represent?
The total number of protons and neutrons in the atom
How do you calculate the number of neutrons in an atom?
Subtract the atomic number from the mass number
Fill in the blank: An atom of gallium has an atomic number of 31 and a mass number of 70. The number of _______ is 31.
Electrons
True or False: The charge on the electrons is the same size as the charge on the protons.
True
What happens to the charges in an ion?
The number of protons does not equal the number of electrons, resulting in an overall charge
What are the three subatomic particles that make up an atom?
Protons, Neutrons, Electrons
Protons are positively charged, neutrons are neutral, and electrons are negatively charged.
What is the relative mass of a proton or neutron?
1 mass unit
Electrons have a relative mass of approximately 0.0005 mass units.
What charge do protons carry?
Positive charge
What charge do neutrons carry?
Neutral charge
What charge do electrons carry?
Negative charge
