Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
Indirect Evidence
|
Evidence from behavior rather than seeing or touching it
(Like an inferance) |
|
|
Greek Model of the Atom(Democritus)
|
Atom is the smallest possible piece of matter
|
|
|
Protons
|
Positively charged particles located in the nucleus
|
|
|
Nuetrons
|
Nuetral particles located in the nucleus
|
|
|
Electrons
|
Negatively charged particles arranged in energy levels
(K.L.M ect. which orbit the nucleus) |
|
|
Rutherford
|
-Atom is mostly empty space
-Electrons scattered around edge -Positively charged nucleus -Gold Foil experiment led to this model |
|
|
Thomsan
|
Positively charged particles scattered throughout negatively charged electrons
|
|
|
Dalton
|
-Atoms are indivisible and indistructable
-Atoms of the same element are the same -Atoms of a different element are different -Compounds form by joining atoms of two or more elements |
|
|
Bohr
|
Energy levels are located certain distances from the nucleus
|
|
|
Atomic Number
|
Number of protons in the nucleus of an atom
|
|
|
Isotope
|
Atoms of the same element that differ by their mass number
|
|
|
Mass Number
|
The sum of the proton and nuetron in the nucleus of an atom
|
|
|
Atomic Mass
|
The average mass of all the isotopes of that element in the proportion that they occur in nature
|
|
|
Quarks
|
Elementary Particles
|
|
|
Strong Force
|
-Opposes the electromagnetic force of repulsion between protons
-holds the nucleus of the atom together -greatest of all four atomic forces but has limited range |
|
|
Weak Force
|
-Responsible for radioactive decay
-During radioactive decay a nuetron changes into a proton and an electron |
|
|
Electromagnetic Force
|
-Can either attract or repel the particles on which it acts
-Opposite charges attract -like charges repel |
|
|
Gravity
|
-Weakest force known in nature
-The force of attraction between all objects in nature |
