Isotopes & Atomic Mass
This term describes atoms of the same element with different numbers of neutrons.
What are isotopes?
The distance from crest to crest on a wave is known as this.
What is wavelength?
This is the correct ground-state electron configuration for sodium (Na).
What is 1s² 2s² 2p⁶ 3s¹?
Turning water vapor into liquid water is this type of phase change.
What is condensation?
Across Period 3 from Na → Cl, this property increases
What is ionization energy?
True or False: Isotopes are still the same element even if their masses are different.
What is true?
All electromagnetic waves share this property.
What is they travel at the same speed?
These three rules determine how electrons fill atomic orbitals.
What are the Aufbau principle, Hund’s rule, and Pauli exclusion principle?
Phase changes are this type of change.
What is physical?
Down Group 17, ionic radius does this.
What is increases?
Neon has isotopes called Ne-20, Ne-21, and Ne-22. The number written after the dash tells you this.
What is the mass number?
Shorter wavelength means this happens to the energy.
What is energy increases?
A p orbital has this shape.
What is two lobes / two spheres side-by-side?
Melting paraffin wax is an example of this energy process.
What is endothermic?
Metals typically have ___ ionization energy and ___ electron affinity.
What are low ionization energy and low electron affinity?
If a sample starts at 250 g and drops to 125 g, what fraction of the original sample remains?
What is one-half?
The wavelength of x-rays with a frequency of 3.0 × 10¹⁶ Hz can be calculated using this equation.
What is λ = c / f?
Holmium’s noble gas notation begins with this noble gas.
What is [Xe]?
Oil and water form this type of mixture.
What is a heterogeneous mixture?
The element with configuration [Xe] 6s¹ is this alkali metal.
What is cesium?
A student mixes different isotopes of an element together. The “average atomic mass” on the periodic table depends on two things: the mass and this factor.
What is relative abundance?
Flame tests: Strontium’s 640 nm emission corresponds to this general color.
What is red?
An element with configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁵ has this atomic number.
What is 43?
Using density, explain why oil floats on water: oil is _____ dense than water.
What is less dense?
A real-world use of periodicity might involve predicting boiling points of halogens or designing alloys. Name one use.
Example: “Predicting material properties when choosing metals for construction.”