Basic Ideas About Atoms Flashcards
Atomic number
Number of protons (number of protons is same as number of electrons)
Mass of atom
Number of protons + number of neutrons
Isotopes
Different number of neutrons
Charge of an alpha particle
+2
Alpha decay effect on atomic number and mass number
Atomic number -2
Mass number -4
What are beta particles?
High energy electrons emitted by nucleus
What are alpha particles?
Helium nucleus
Beta particle charge
-1
Affect on proton number (atomic number) of atom undergoing beta decay
+1
Beta decay affect on neutrons
-1
How would beta decay affect mass?
No effect
Beta particle has a mass of 0
Electrons have a negligible mass
Positron emission result of
1 proton changing into a neutron emits a positron
Positron emission affect on number of protons (atomic number)
-1
Positron emission affect on number of neutrons
+1
Positron emission affect on mass
No change
Half life definition
Time taken for half a radioactive sample to decay
Frequency is ____ to wavelength
Inversely proportional
Frequency is ___ to energy
Directly proportional
Equation linking energy to frequency
E=hf
Equation linking frequency to wavelength
F=v/wavelength
Significance of convergence limit (last line on right of bar) of layman series
Gives first ionisation energy
Lyman series for what light?
UV
Balmer series for what light?
Visible
Lines of Balmer series fall to which energy level?
N=2
Lines of Lyman series fall to which energy level?
N=1
