Isotopes
Akopọ
You might expect every atom of an element to be identical, but many elements come in slightly different versions. These versions, called isotopes, have the same chemistry but different masses. Chlorine, for example, is a blend of two isotopes, which is why its relative atomic mass is not a whole number.
In this lesson you will learn exactly what an isotope is, why isotopes of an element behave identically in chemical reactions, and how their existence explains the average masses you see in the Periodic Table.
Awọn Afojusun
- Define isotopes as different atoms of the same element that have the same number of protons but different numbers of neutrons.
- Interpret and use symbols for atoms, e.g. ¹²₆C, and ions, e.g. ³⁵₁₇Cl⁻.
- [Supplement] State that isotopes of the same element have the same chemical properties because they have the same number of electrons and therefore the same electronic configuration.
- [Supplement] Calculate the relative atomic mass of an element from the relative masses and abundances of its isotopes.
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Oriire fun ipari ẹkọ lori Isotopes. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
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- Isotopes of an element have the same number of: A. Neutrons B. Protons C. Nucleons D. Mass numbers Answer: B
- Isotopes of an element differ in their number of: A. Protons B. Electrons C. Neutrons D. Shells Answer: C
- Why do isotopes of an element react in the same way? A. They have the same number of neutrons B. They have the same electron arrangement C. They have the same mass D. They are radioactive Answer: B
- How many neutrons are in an atom of chlorine-37? (proton number 17) A. 17 B. 18 C. 20 D. 37 Answer: C
- Why is the relative atomic mass of chlorine 35.5 and not a whole number? A. Chlorine has half a neutron B. It is an average of its isotopes C. Chlorine has no isotopes D. The protons vary Answer: B
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Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Atomic Structure and Symbolism
Write and interpret symbols that depict the atomic number, mass number, and charge of an atom or ion
"Chemistry: Atomic Structure and Symbolism" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/2-3-atomic-structure-and-symbolism. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Evolution of Atomic Theory
Outline milestones in the development of modern atomic theory
"Chemistry: Evolution of Atomic Theory" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/2-2-evolution-of-atomic-theory. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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