Valence Electrons
Lewis Dot Structures
Bonding
Periodic Trends & Geometry
Challenge Calculations
200

How many valence electrons does fluorine have?

What is 7

200

How many dots are in the Lewis Dot Structure for Mg?

What is 2 dots?

200

What type of bond forms between a metal and nonmetal?

What is an ionic bond?

200

What shape is a molecule with two bonding pairs and no lone pairs?

What is linear?

200

Calculate density: mass 20 g, volume 4 mL

What is 5 g/mL?

400

How many valence electrons do Group 2 elements have?

What is 2?

400

Draw the Lewis Dot Structure for oxygen.

What is 6 dots around O?

400

What type of bond shares electrons equally?

What is a nonpolar covalent bond?

400

Which periodic trend increases across a period?

What is electronegativity?

400

How many moles are in 88 g of CO₂?

What is 2 moles?

600

Which electrons are involved in bonding?

What are valence electrons?

600

How many total dots are shown for nitrogen?

What is 5 dots?

600

Compare ionic and covalent bonding.

What is ionic transfers electrons; covalent shares electrons?

600

What is the geometry of a molecule with four bonding pairs and no lone pairs?

What is tetrahedral?

600

How many atoms are in 2 moles of Na?

What is 1.20 × 10²⁴ atoms?

800

Why do noble gases have full valence shells?

What is they already have full outer shells?

800

Why do Lewis Dot Structures not show inner electrons?

What is they do not participate in bonding?

800

Which bond type forms a crystal lattice?

What is ionic bonding?

800

Why does ionization energy increase up a group?

What is atoms hold electrons more tightly due to smaller atomic size?

800

Calculate molar mass of CaCl₂

What is 111 g/mol?

1000

Predict valence electrons for sulfur and explain.

What is 6 valence electrons because sulfur is in Group 16?

1000

Draw the Lewis Dot Structure for chlorine ion (Cl⁻)

What is 8 dots with brackets and a negative charge

1000

Predict the bond type between Na and Cl and explain.

What is ionic bonding because electrons are transferred?

1000

Predict the shape of a molecule with 3 bonds and 1 lone pair.

What is trigonal pyramidal?

1000

How many molecules are in 1.25 moles of H₂O?

What is 7.53 × 10²³ molecules?