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Flashcards in Chapter 4 Deck (26):
0

Said everything is made up of Atoms, which are invisible

Democritus

1

Everything is made up of atoms, which are indivisible

Daltons atomic theory

2

Discovered the electron

J.j. Thompson

3

Discovered charge of an electron

Millikan

4

Amount of deflection in crookes tube depends on

1)magnitude of charge
2)velocity of particle
3)mass

5

Discovered the nucleus and proton

Rutherford

6

Discovered the neutron

Chadwick

7

The number of protons in the nucleus and number of electrons

Atomic number

8

Protons + neutrons in the nucleus

Mass number

9

Adams of the same element with different numbers of neutrons

Isotopes

10

Average mass of the Atoms of an element

Atomic mass

11

1/12 the mass of a Carbon 12 Atom

Atomic mass unit

12

Emission of a raise and particles from the nucleus of an Atom

Radioactivity

13

Unstable isotopes decay to form stable Atoms

Radioactive decay

14

Releases and alpha particle

Alpha radiation

15

Releases a beta particle

Beta radiation

16

A flash of pure energy

Gamma radiation

17

Time for half of the Atoms in asample to decay

Half life

18

Splitting Atoms

Fission

19

Sticking atoms together

Fusion

20

Raise and particles emitted by the radioactive material

Radiation

21

Reaction that involves a change in an Atoms nucleus

Nuclear reaction

22

Contains two protons and two neutrons

alpha particle

23

Shows the atomic number and mass numbers of the particles involved

Nuclear equation

24

Electron with a 1- charge

Beta particle

25

High energy radiation that possesses no mass

Gamma ray