Download Chapter Four-The Structure of the Atom Notes

Chapter Four-The Structure of the Atom Notes-Section 2
Subatomic Particles
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Subatomic particles in an atom are
_____________________________________________________________________
Draw the diagram in the space below:
Protons
• The amount of positive charge_____________________________________________
• A proton is
______________________________________________________________
_________________________________________
• Mass of a proton is almost the same as the mass of a neutron.
Electrons
• ________________________________discovered the electron
• An electron is ___________________________________________________________
___________________________________________________________
• Mass of an electron IS MUCH SMALLER than the mass of a proton or neutron.
Neutrons
— A neutron is ____________________________________________________________
_______________________________________
— Its mass is ____________________________________________________________
Atomic Number
— Atoms of a specific element _______________________________________________
— For example, there is only one proton in the nucleus of each and every hydrogen
atom. ____________________________________________
— The atomic number of an element=________________________________
_____________________________
— The atomic number of an element=________________________________
_____________________________
Mass Number
— The mass number of an atom is ___________________________________________
__________________________________________
— An atom of aluminum with 13 protons and 14 neutrons has a mass number of 27.
— Remember, the mass number is the ___________________________you see on the
Periodic Table.
Number of neutrons= _____________________________________
Practice Questions
— How many electrons are there in the element titanium? (Symbol- Ti)
— How many protons are there in oxygen? (O)
— What is the atomic number of phosphorus? (P)
— What is the mass number of potassium? (K)
— How many neutrons does neon have? (Ne)
— How many neutrons does chlorine have? (Cl)
Isotopes
— Every atom of a given element ____________________________________________
_______________________________________
— Isotopes of atoms of the same element _____________________________________
— _________________________________________
— Isotopes of an element have the same atomic number but different mass numbers
________________________________________________________________________
• Isotopes of oxygen_________________________________________________