Physics- P4 Part A

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  • Created by: 13clarken
  • Created on: 16-03-18 18:02
Who replaced Thomson's plum pudding model with the Nuclear model
Rutherford
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Nuclear model then became the current model of the atom with a ... charged nucleus surrounded by negative electrons
positively
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Current model of Atom: Nucleus is tiny ... is 10,000 times smaller than the radius of the atom
radius
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Current model of Atom: Rest of atom is mostly ...
empty space
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Current model of Atom: Negative electrons are on ... round the outside of the nucleus
shells
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Number of ... =Number of electrons
protons
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What are different forms of the same element
Isotopes
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Isotopes have the same number of protons, but a different number of ...
neutrons
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These particles are Helium Nuclei: -This radiation is when the particle is emitted. -Don't penetrate materials, are stopped quickly. -Don't travel far in air, absorbed by a sheet of paper. -Strongly ionising because of their size
Alpha Particles
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How easily radiation knocks electrons off atoms
Ionising
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These particles are High Speed Electrons released: -They have virtually no mass, a charge of -1. -Moderately ionising and Moderately penetrating. -Range in air of only a few meters. -Absorbed by a sheet of aluminium (5mm)
Beta Particles
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Theses are Electromagnetic waves with a short wavelength:- Penetrate far into materials without being stopped and will travel a long distance in air. -Weakly ionising =, pass through things instead of colliding, but during a collision there is damage
Gamma Rays
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Mass and ... have to balance in nuclear equations
Atomic numbers
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They are waves of showing ... decay
radioactive
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Alpha decay ... the charge of the nucleus
decreases
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Beta decay ... the charge of the nucleus. Mass doesn't change because it loses a neutron and gains a proton
increases
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Gamma rays don't change the charge or mass of the nucleus. It is a way of getting rid of ... meaning no change to atomic mass or atomic number
excess energy
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This is a totally random process
Radioactivity
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Radiation can be measured using a ... tube which records the count rate
Geiger Muller
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Half life can be used to find the rate of decay- It's ...
activity
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Activity is measured in ...
becquerels
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This is the time taken for the number of radioactive nuclei in an isotope to halve
Half life
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You can measure a half life using a ...
graph
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Other cards in this set

Card 2

Front

Nuclear model then became the current model of the atom with a ... charged nucleus surrounded by negative electrons

Back

positively

Card 3

Front

Current model of Atom: Nucleus is tiny ... is 10,000 times smaller than the radius of the atom

Back

Preview of the front of card 3

Card 4

Front

Current model of Atom: Rest of atom is mostly ...

Back

Preview of the front of card 4

Card 5

Front

Current model of Atom: Negative electrons are on ... round the outside of the nucleus

Back

Preview of the front of card 5
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