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;
16 Cards in this Set
- Front
- Back
|
No elements with the atomic number greater than ____ is found naturally on earth
|
92
|
|
|
Elements combine to produce what?
|
Compounds
|
|
|
What tool is used to organize information about elements
|
Periodic Table
|
|
|
Atom's identity is directly related to what?
|
Number of protons in the nucleus
|
|
|
Vertical columns in the periodic table are called |
Groups or families |
|
|
Rows in the periodic table are called |
Periods |
|
|
How are compounds formed |
when elements react chemically |
|
|
Covalent (Molecular) Bonds |
When two nonmetals react, atoms share electrons to create this bond |
|
|
Ionic Bond |
When a metallic element reacts with a nonmetallic element it creates this bond |
|
|
Physical Changes |
The chemical composition of the substance does not change |
|
|
Chemical Changes |
A different substance is formed |
|
|
The Law of Conservation of Matter ( Mass) |
The mass remains the same even after a substance has changed within a closed system |
|
|
Chemical Equation |
Represents the changes that take place in a chemical reaction |
|
|
What type of chemical reaction occurs when energy is released |
Exothermic |
|
|
What type of chemical reaction occurs when energy is absorbed? |
Endothermic |
|
|
These elements have properties that are both metals and nonmetals |
Metalloids |
