Covalent or Ionic?
Is NaCl covalent or ionic?
Ionic
What is the charge on a sodium ion?
+1
Does electronegativity increase or decrease across a period?
Increases
How many valence electrons does hydrogen have?
1
What noble gas does Na⁺ resemble?
Neon [Ne]
Is CO₂ covalent or ionic?
Covalent
What is the charge on an oxygen ion?
-2
Which is more electronegative: oxygen or sulfur?
Oxygen
How many valence electrons does nitrogen have?
5
What ion does oxygen form to reach noble gas config?
O²⁻
Explain why MgCl₂ is an ionic compound.
Metal + nonmetal; electrons transferred
Does a cation lose or gain electrons?
Lose electrons
Why does fluorine have the highest electronegativity?
Small size, high nuclear charge
How to determine valence electrons?
Group number for main group elements (group one is 1, group 15 is 5)
Electron configuration for Mg²⁺?
1s² 2s² 2p⁶
Is H₂O ionic, non-polar covalent, or polar covalent?
Polar covalent
Name an example of a common anion.
Any non-metal
Compare electronegativity of metals and nonmetals.
Nonmetals are higher
Max number of valence electrons in a shell?
8
How does chlorine become Cl⁻?
Gains 1 electron
Predict if KF is ionic or covalent and explain.
Ionic; metal + nonmetal
Explain why calcium forms a 2+ ion.
Loses 2 valence electrons to reach noble gas config
Predict bond type between K and F
Ionic; large difference in electronegativity
How many valence electrons in Cl⁻?
8
Predict ion and noble gas config for aluminum.
Al³⁺, like neon. [Ne]