Unit 4 Flashcards
Which gases are unreactive (inert)?
Noble gases, group 18
What is an ion?
an atom or group of atoms with a charge
What takes place in an ionic bond?
oppositely-charged ions attract, metal + nonmental
What takes place in a covalent bond?
electrons are shared between nonmetals
How many electrons are shared between two atoms in a double covalent bond?
4
How many electron pairs are ion Nitrogen on in NH₃?
3 bond pairs and 1 lone pair, 4 total
What type of bonding is found in a carbon dioxide molecule?
Covalent, 2 nonmetals bonding
What shape does a water molecule have?
bent
What molecular shape is SO₃⁻²?
trigonal pyramidal
In the Lewis dot structure, what do the dots represent?
valence electrons
What is the correct ionic symbol for strontium?
Sr²⁺ , all group 2 on the periodic table have a charge of ²⁺
What charge does group 1 ions have?
+1
Will group 1 atoms lose or gain an electron when forming an ion?
lose an electron
Will nonmetals, like sulfur, gain or lose electrons when forming an ion?
gain electrons
What type of bond does NaCl have?
Ionic, because it is between a metal and nonmetal
What type of bond does O₂ have?
nonpolar covalent, because the electrons are shared equally
What type of bond does HF have?
polar covalent, because the electrons are not shared equally
What is the correct name and formula formed between Sodium and Sulfur?
Sodium Sulfide, Na₂S (using the binary ionic bond rules Na⁺ and S⁻²)
Name 3 characteristics of a covalent bond.
1)electrons are shared, 2) poor conductors of electricity, 3)low melting and boiling points
Where are nonmetals located on the periodic table?
right side
Carbon dioxide has how many double bonds?
2
How many pairs of unshared electrons does H₂S have?
2
What geometric shape does BH₃ have?
trigonal planar
What geometric shape does CH₄ have?
tetrahedral
