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Question 1: By varying the conditions, materials can transition between solids, ________, gases and plasmas.
Supercritical fluidPhase transitionLiquidColloid

Question 2: [22] The table itself is a visual representation of the periodic law which states certain chemical properties of elements repeat periodically when arranged by ________.
LanthanumAtomic numberPeriodic tableHafnium

Question 3: About 339 nuclides occur naturally on ________, of which 269 (about 79%) have not been observed to decay.
NatureEarthSunMoon

Question 4: Examples include the element carbon and the ________.
Organic compoundBiochemistryAmino acidOrganic chemistry

Question 5: The number of neutrons relative to the protons determines the stability of the nucleus, with certain isotopes undergoing ________.
Nuclear fusionNuclear fissionRadioactive decayGamma ray

Question 6: An atom containing an equal number of protons and electrons is electrically neutral, otherwise it has a positive or negative charge and is an ________.
Half cellIonElectrolyteLithium-ion battery

Question 7: [126][127] Most of the helium in the crust of the Earth (about 99% of the helium from gas wells, as shown by its lower abundance of helium-3) is a product of ________.
Nuclear fusionGamma rayNuclear fissionAlpha decay

Question 8: Spin is measured in units of the reduced ________ (ħ), with electrons, protons and neutrons all having spin ½ ħ, or "spin-½".
PhotonQuantum mechanicsPlanck constantWave–particle duality

Question 9: Likewise, through ________, an electron in a higher energy state can drop to a lower energy state while radiating the excess energy as a photon.
Spontaneous emissionAtomStimulated emissionPhonon

Question 10: While isotopes with atomic numbers higher than lead (82) are known to be radioactive, an "________" has been proposed for some elements with atomic numbers above 103.
UraniumTable of nuclides (combined)Island of stabilityRadon
















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