Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.
Don't know
Know
remaining cards
Save
0:01
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:
Retries:
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

chap 17-18 ps

TermDefinition
element pure substance
aristotle believed in air fire earth water
element # how many? 117
naturally occuring elements 92
johann Dobereiner triads
periodicity repition of certain properties at periodic intervals when elements are placed in order of atomic mass
John Newlands aranged table in order of atomic mass every eight had similar props: OCTAVES
Dmitri Mendelev in order of atomic mass left blanks for undiscovered elements credited for modern pecha
Henry Moseley counted protons w/ x-rays rearanged pecha into modern one and revised periodic law
periodic law (modern changed from atomic mass to _____) The properties of elements vary in a periodic way with their atomic number
2nd law of thermodynamics all natural processes move toward a state of minimum energy
atoms are most stable with 8 valence electrons octet rule
covalent sharing electrons non metal with non metal high melting temp
ionic low melting temp produce electricity when dissolved in water metal/nonmetal give away and take electrons
mettalic metal/metal
electron sea electrons bounce everywhere
electron affinity strength of attraction to UNBONDED atoms
electronegativity how powefully it can take electrons when bonded (flourine highest)
Created by: pickleman792