Atomic Structure & Isotopes
This subatomic particle determines the identity of an element.
What is a proton?
This term describes the time it takes for half of a radioactive sample to decay.
This term describes the time it takes for half of a radioactive sample to decay.
Classify NaCl as an element, compound, or mixture.
What is a compound?
As you move across a period, atomic radius (increases/decreases).
What is decreases?
The highest point on a wave.
What is the crest?
Two atoms of the same element with different numbers of neutrons are called this.
What are isotopes?
If you start with 64 g of a substance with a 10-minute half-life, how much remains after 20 minutes?
What is 16 g?
Melting ice is this type of change: physical or chemical?
What is a physical change?
This trend increases going up and to the right on the periodic table.
What is ionization energy or electronegativity?
As wavelength decreases, frequency and energy do this.
What is increase?
This particle is negatively charged and found outside the nucleus.
What is an electron?
After 40 minutes (4 half-lives), how much remains of 64 g of a sample?
What is 4 g?
Density is this type of property: intensive or extensive?
What is intensive?
Explain why radius decreases across a period.
What is increased nuclear charge pulls electrons closer?
Order these from lowest to highest wavelength: gamma, UV, visible, microwave.
What is gamma → UV → visible → microwave?
An element has 80% X-20 and 20% X-22. Calculate the average atomic mass.
What is 20.4 amu?
The type of decay curve radioactive materials follow.
What is exponential decay?
Air is labeled as this type of matter because it contains multiple gases.
What is a mixture?
Metal characteristics include these two properties.
What is conduct electricity and are malleable?
A wave has a frequency of 3.0 × 10¹⁴ Hz. Calculate λ using c = λν.
What is 1.0 × 10⁻⁶ m?
How many protons, neutrons, and electrons are in ³¹P³⁻?
What is 15 p⁺, 16 n°, and 18 e⁻?
A scientist graphs remaining mass vs. time for a radioactive isotope. What will the curve look like?
What is a decreasing exponential curve approaching zero?
Explain why oil and water form a heterogeneous mixture.
What is because they differ in polarity and density?
A metal has a mass of 43.2 g and a volume of 6.0 mL. What is the density of the metal.
What is 7.2 g/mL?
Name the full EM spectrum from highest energy to lowest.
What is gamma → X-ray → UV → visible → IR → microwave → radio?