Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
Normal Size Small Size show me how
Chapter 17-18
9th grade Physical Science
| Question | Answer |
|---|---|
| Element | any pure substance that is made of only one kind of atom |
| Today there are _____ elememts | 117 |
| The heaviest elements are all _________ and have VERY SHORT half lives so they are difficult to analyze | radioactive |
| There are ___ naturally occurring elements | 92 |
| Mercury (Hg) and Bromine (Br) are ________ at room temperature | liquid |
| Hydrogen (H), Helium (He), Nitrogen (N), Oxygen (O2), Fluorine (F), Neon (Ne), Chlorine (Cl), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn) are ______ at room temperature | gases |
| Monotomic elements | Helium, Neon, Argon, Krypton, Xenon, and Radon |
| Diatomic elements | Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine |
| Who created the periodic table | Dmitri Mendeleev |
| Who placed elements in order of increasing MASS | Johann Dobereiner |
| The repetition of certain properties at regular intervals when elements were placed in order of atomic MASS | Periodicity |
| Periodic law | The properties of the elements vary with their atomic numbers in a periodic way |
| Metals | Luster, Malleable, Conduct electricity, Ductile |
| Non-metals | Lack luster, Brittle, Don't conduct electricity , not ductile |
| The horizontal rows of the periodic table are called | Periods |
| A period number tells how many ________ the elements in that period have in their GROUND STATE | MAIN ENERGY LEVELS |
| The MORE energy levels an atom has, the _______ it is | LARGER |
| THE SECOND LAW OF THERMODYNAMICS | the tendency for atoms to form bonds |
| Octet rule | atoms generally are most stable when they have 8 electrons in their valence energy level |
| When atoms gain and lose electrons they make | IONS |
| Cations are _______ | positive |
| Anions are _______ | negative |
| Electron affinity | deals with the strength of attraction of electrons to UNBONDED ATOMS |
| Atoms with _____ electron affinities will take or share electrons from other atoms | high |
| Atoms with ____ electron affinities will lose their valence electrons | low |
| Electronegativity | deals with an atom's ability to attract and hold electrons when BONDED TO OTHER ATOMS |
| Covalent bonds | Non-metal/Non-metal; share electrons |
| Ionic bonds | metal/non-metal; giving away and taking electrons |
| Metallic bonds | metal/metal; everyone shares the electrons Electron Sea Theory |
| Electron Sea Theory | Atoms with weak electronegatives usually have only a few loosely held valence electrons. These atoms bond by sharing their easily lost electrons among many atoms. |
Created by:
faithdavis
Popular Physical Science sets