3 syllables: I, so, topes. Stress on I.
EYE-suh-tohps
/ˈaɪsəˌtoʊps/
Isotopes is pronounced EYE-suh-tohps (/ˈaɪsəˌtoʊps/). It has three syllables (I-so-topes), with the stress on "I". Isotopes is the plural of isotope, referring to forms of a chemical element that have the same number of protons but different numbers of neutrons. The term is used mainly in science contexts such as chemistry and physics to discuss nuclear properties and mass-related variations. In everyday usage, it appears in academic writing, research discussions, and technical reports about element radioactivity and stability.
nounIsotopes is the plural of isotope, referring to forms of a chemical element that have the same number of protons but different numbers of neutrons. The term is used mainly in science contexts such as chemistry and physics to discuss nuclear properties and mass-related variations. In everyday usage, it appears in academic writing, research discussions, and technical reports about element radioactivity and stability.
How to Pronounce Isotopes
"Researchers compared isotopes of carbon to infer the age of the sample."
"The isotopes of uranium show different half-lives, which is crucial for dating rocks."
"Chemists study isotopes to understand reaction mechanisms and mass distribution."
Isotopes is pronounced /ˈaɪˌsoʊˌtoʊps/ in US English and /ˌaɪ.səˈtoʊps/ in most UK varieties, with Australian often aligning to /ˈaɪ.səˌtoʊps/. The primary stress is on the first syllable; note the sequence 'i-so-to-pes' where the 'to' has a long o. Start with the long I sound, then a light 'so' or 'sə' depending on accent, then a clear 'to' and final 'ps' cluster. For clarity in rapid speech, avoid adding extra vowels between syllables.
Common mistakes include misplacing stress (stressing the second syllable as 'i-SO-topes'), reducing the 'to' to a quick 'toh' without the preceding syllable lightness, and mispronouncing the final 'ps' as a separate syllable. Correct by keeping primary stress on the first syllable and sealing the final 'ps' as a consonant cluster /ps/ without voicing a vowel between 'to' and 'ps'. Practice by saying 'I-so-topes' slowly, then blend the last two consonants.
In US English, the initial 'I' is a longer diphthong /aɪ/ and the overall rhythm leans toward strong first syllable; UK and AU may reduce the second syllable slightly, giving a lighter /ə/ for the middle 'so' in some speakers. All varieties retain /ps/ at the end, but US tends to a crisper /ˈaɪ.soʊˌtoʊps/ while UK often renders as /ˌaɪ.səˈtoʊps/ with a more schwa-like middle syllable and stronger final consonant cluster.
The difficulty comes from the consonant cluster at the end -ps, which can be mispronounced as just 'p' or 'ps' with a lot of voicing. The middle syllable can be reduced in rapid speech, leading to 'I-so-topes' or 'I-suh-topes'. Also, the initial diphthong requires precise tongue height, and many speakers add an extra vowel between 'iso' and 'to' or misplace the primary stress. Focus on the clean /ps/ closure and correct stress to master it.
Isotopes has a primary stress on the first syllable: /ˈaɪ.soʊˌtoʊps/ in US, with a secondary cue on the 'to' in some UK forms. The 'iso' portion acts like a two-syllable chunk, while the 'to' carries significant weight for rhythm in scientific speech. The final 'ps' is fully pronounced as /ps/; do not voice it as 'p—s' or soften it. Remember the toe to 'ps' closure occurs rapidly.
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Isotope derives from the Greek iso- meaning 'equal' and topos meaning 'place', coined by Frederick Soddy in 1913 to describe elements that occupy the same place on the periodic table yet have different nuclear masses. The term captured the core idea that isotopes of a given element share chemical behavior but differ in isotopic mass and neutron count. Early work on isotopes arose from mass spectrometry developments and radiochemical experiments that demonstrated mass differences among elements believed to be singular. First widely cited use appeared in Soddy and Kruyt's discussions on radioactive decay and isotopic composition in the 1913–1914 period, with isotope concepts expanding as neutron discovery clarified mass variation. Over time, isotopes became central to fields from dating methods (carbon-14 dating) to medical imaging and tracer studies, reinforcing the distinction between chemical equivalence and nuclear diversity. The modern vocabulary preserves iso- 'equal' and topos 'place', while the practical meaning has broadened to include not just mass variants but nucleosynthetic processes, stable vs. radioactive isotopes, and isotopic labeling techniques in research. The word traveled through scientific literature into education, science journalism, and general discourse, solidifying its status as a fundamental term in chemistry and physics.
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Words that rhyme with "Isotopes"
-tos sounds
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