Electron Configurations
Valence Electrons
Ionic Bonds
Covalent Bonds
Chemical Reactions
100
Based on the electron configuration of a sodium atom, what is it's number of valence electrons?
1s22s22p63s1
1
100
How do you determine the number of valence electrons in an atom?
group #
100
What ion does a magnesium atom form when it loses electrons?
Mg+2
100
How do you represent covalent bonds using Lewis dot diagrams?
lewis dot structure represents valence electrons that are binding the atoms with single, double, and triple bonds
100
What type of reaction is represented here?
K + NaCl --> KCl + Na
single replacement
200
How does the electron configuration predict bonding in elements?
by revealing an element's valence electrons
200
Explain how to identify valence electrons from an electron configuration.
last shell contains the group number or number of valence electrons
200
Name the bond type formed between sodium and chlorine.
ionic
200
What is the difference between polar and non-polar covalent bonds?
polar is an unequal sharing of valence electrons
nonpolar is an equal sharing of valence electrons
200
How do balanced chemical equations support the law of conservation of mass?
the same kind of atoms must be equal on the reactant side and product side of the reaction
300
Describe how excited electrons can release electromagnetic radiation.
when they fall from a higher, unstable energy level back to a lower, more stable energy level
300
What is the significance of valence electrons in bonding?
valence electrons are lost, gained, or sharded during bonding
300
What is the formula for the ionic compound formed from calcium and sulfur?
CaS or Ca2S2
300
What is the molecular geometry of H2O?
bent
300
Does this chemical reaction follow the law of conservation: CaSO4 + Mg(OH)2 → Ca(OH)2 + MgSO4
yes because the reactants are balanced with the products
400
Based on silicon's electron configuration, how many valence electrons does silicon have?
1s² 2s² 2p⁶ 3s² 3p²
4
400
How many valence electrons does carbon have?
4
400
How do polyatomic ions affect the naming of ionic compounds?
they are named using their established names without changing the ending to "-ide"
400
Draw the lewis structure for CH4 and identify the molecular geometry.
tetrahedral
400
Predict the products of the reaction:
Fe2O3 + C -->
Fe + CO2
500
What is the octet rule in relation to electron configurations?
main group atoms tend to gain, lose, or share valence electrons to achieve a stable electron configuration with eight electrons in their outermost shell
500
Which group of atoms can Ca most likely bond with?
group 6
500
Identify the ion aluminum forms in aluminum sulfate.
Al+3
500
Is H2O ionic, polar covalent, or nonpolar covalent?
polar covalent
500
Transform the word equation "magnesium + oxygen → magnesium oxide" into a balanced chemical equation.
2Mg + O2 --> 2MgO