Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

M. Douglas Chapter 5

Atomic theory and structure

Dalton's atomic model Elements are indivisible atoms; Same elements are alike in mass and size; different elements differ in mass and size;law of conservation of matter; law of definite proportion; law of multiple proportion
What is the law of definite composition? compounds always contain two or more elements combined in definite proportion by mass
What is the law of multiple proportion? Atoms of two or more elements may combine in different ratios to form different compounds.
What is a law? A summary of observed behavior.
What is a model of theory? A model is an attempt to explained the observed behavior.
What are three subatomic particles? Electrons, Neutrons and Protons.
Who was J.J. Thomson? A scientist from England that introduced the idea of subatomic particles. (1897)
What is the atomic number? It represents the number of protons in the nucleus of an atom.
What is the mass number? It represents the number of protons and neutrons.
What are isotopes? Elements having the same atomic number but different atomic mass (mass number).
How do you use isotopic notation? Mass number on the left superscript, atomic number on the left subscript of the elements symbol.
How do you identify isotopes of an element? By the symbol a hyphen then the number of mass number of the isotope. i.e. C-12; C-13; C-14
Created by: Vipdesigner