Math & Units
Convert 2.5 × 10³ to standard form.
2500
How many protons does ²⁷₁₃Al have?
13
Atomic radius increases in what direction on the periodic table?
Right → Left and Top → Bottom
What type of bond forms between metal + nonmetal?
Ionic bond
What is the chemical formula of water?
H₂O
Write 0.00042 in scientific notation.
4.2 × 10⁻⁴
How many neutrons does ³⁷₁₇Cl have?
20
Which has the largest atomic radius: Na or Cl?
Na
What type of bond forms between two nonmetals?
Covalent bond
Name NaCl.
Sodium chloride
Solve: 25.0 ÷ 5000
5.00 × 10⁻³
How many electrons does Al³⁺ have?
10
Which has a smaller radius, Al³⁺ or Al⁰?
Al³⁺
What is the molecular geometry of H₂O?
Bent (AX₂E₂)
Name CO₂.
Carbon dioxide
Convert 2500 mL to L.
2.5 L
What group are the noble gases found in?
Group 18
Define ionization energy.
Energy required to remove an electron from an atom.
What is the molecular geometry of NH₃?
Trigonal pyramidal (AX₃E₁)
What is the formula for aluminum oxide?
Al₂O₃
If 1 inch = 2.54 cm, convert 10.0 inches to cm.
25.4 cm
Which element is a halogen?
Define electron affinity.
Energy released when an atom gains an electron.
In the bond H–F, the dipole moment points toward which atom?
F (fluorine, more electronegative)
Name FeCl₃
Iron(III) chloride