Ionic Bonds 1
Ionic Bonds 2
Covalent Bonds 1
Miscellaneous
Atoms and Valence Electrons
100
The attraction between two oppositely charged ions is what?
An ionic bond
100
When an atom loses and electron, it becomes a what?
positive ion
100
A chemical bond formed when two atoms share electrons is called what?
A covalent bond
100
In the periodic table, elements are arranged in order of increasing ______________.
atomic number
100
The smallest particle of an element is known as what?
An atom
200
Ions that are made of more than one element are examples of what?
polyatomic ions
200
When an ionic compound forms, the total number of positive charges and the total number of negative charges must be _________.
balanced
200
When two pairs of electrons are shared between two atoms, it is called a what?
double bond
200
Write the formula for Magnesium sulfate.
MgSO4 (the 4 is a subscript)
200
The electrons that are involved in bonding between atoms are what?
valence electrons
300
In the chemical formula for an ionic compound, which item is written first?
the positive ion
300
The formula Li2O stands for what ionic compound? (The 2 is a subscript.)
Lithium oxide
300
A covalent bond in which electrons are shared unequally is called what?
a polar bond
300
What does the formula KHCO3 stand for? (The 3 is a subscript.)
potassium bicarbonate
300
What is the greatest number of valence electrons an element can have?
8
400
Nitrate (NO3), Ammonium (NH4) and Carbonate (CO3) are all examples of what? (The numbers are all subscripts.)
polyatomic ions
400
Write the formula for the compound Sodium carbonate.
Na2CO3 (the numbers are subscripts.)
400
When electrons are shared equally in a covalent bond, the bond is considered to be __________.
nonpolar
400
Compare a covalent bond and an ionic bond.
Covalent bonds are formed when two atoms share electrons and can be either polar or nonpolar. Ionic bonds are formed when an ion either gains or loses an electron. Positively charged ions are attracted to negatively charged ions, but the charges balance each other out.
400
Elements in Group 1 are the ____________ reactive.
most
500
Write the chemical formula for Aluminum Sulfide.
Al2S3 (the 2 and 3 are subscripts)
500
What does the formula NH4NO3 stand for? (The numbers are subscripts.)
Ammonium nitrate
500
Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is considered ____________.
polar
500
Compare and contrast polar bonds and nonpolar bonds.
In a polar bond, the electrons are shared unequally. One atom pulls the electrons slightly more, giving the bond a slight charge. In a nonpolar bond, electrons are shared equally, and there is no electrical charge.
500
Elements in Group 18 (the noble gases) are the ____________ reactive.
least
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