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;
25 Cards in this Set
- Front
- Back
|
Atomic Mass |
the sum of protons and neutrons in an atom's nucleus |
|
|
Atomic Mass Unit (AMU) |
Unit used to express the mass of an atom |
|
|
Isotopes |
atoms in which the number of neutrons vary |
|
|
How do you calculate the atomic mass? |
add protons and neutrons |
|
|
Which tends to give away valence electrons? |
metals |
|
|
Are inert/noble gases highly reactive chemicals? |
No. They do not react under ordinary conditions. |
|
|
Do compounds held together by covalent bonds end to have low melting and boiling points? |
Yes |
|
|
Do ionic compounds conduct electricity when dissolved in water? |
Yes |
|
|
Chemical Bond |
strong force of attraction that holds the atoms of a molecule together |
|
|
Noble Gases |
gases that have full outer energy levels |
|
|
Covalent Bond |
formed when atoms share valence electrons instead of transferring them |
|
|
Ion |
a charged particle |
|
|
Ionic Bond |
the force of attraction between oppositely charged ions |
|
|
Octet Rule |
tendency of atoms to want eight electrons in their outer energy level |
|
|
Oxidation Number |
a number equal to the charge of a particle |
|
|
Chemical Formula |
a combination of chemical symbols and numbers used to represent a compound or indicate the atoms present in a molecules |
|
|
Chemical Symbol |
a one or two letter abbreviation for an element |
|
|
How are ions formed? |
Ions are formed during chemical changes when an atom needs eight valence electrons. One atom gives the other takes, when they do this they form a bond |
|
|
How do chemical bonds actually hold atoms together to form molecules? |
The outer valence electrons of one atom with their negative charge are attracted to the positively charged protons in nucleus's atom |
|
|
How do the molecules of an element differ from those of a compound? |
Elements are made of all the same types of atom . Compounds are a combination of two different atoms |
|
|
Name three diatomic molecules. |
H2 O2 N2
|
|
|
Atoms are more stable in their outer shell if they have....................... |
eight valence electrons |
|
|
An atom with seven valence electrons is generally found as an ion with a charge of............. |
-1 |
|
|
Why does water have powerful dissolving properties? |
Its molecules have an imbalance in charge |
|
|
Name three compounds studied in this chapter |
NaCl-sodium chloride MgO-magnesium oxide CO2-carbon dioxide |
