Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. They have the same proton number but different mass numbers.

True or False? Isotopes of the same element always have the same number of protons.

True. Isotopes are atoms of the same element, so they always have the same number of protons . They differ only in the number of neutrons .

Why do isotopes of the same element have identical chemical properties?

Isotopes have the same number of electrons and therefore the same electronic configuration . Because chemical properties depend on the arrangement of electrons, isotopes react in the same way.

True or False? Isotopes of the same element have identical physical properties because they are the same element.

False. Isotopes have the same chemical properties, but different physical properties (such as density and melting point) because they have different masses — they contain different numbers of neutrons.

Relative atomic mass ( A r ) is the ______ mass of an element's isotopes compared to 1/12th of the mass of a ______ -12 atom.

Relative atomic mass ( A r ) is the average mass of an element's isotopes compared to 1/12th of the mass of a carbon -12 atom.

O LevelChemistryCambridge (CIE)Flashcards2. Atoms, Elements & Compounds2.3 Isotopes

2.3 Isotopes (Cambridge (CIE) O Level Chemistry): Flashcards

Exam code: 5070

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FrontIsotopes
Define isotopes.

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Cards in this collection (6)

Define isotopes.
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. They have the same proton number but different mass numbers.
True or False?
Isotopes of the same element always have the same number of protons.
True.
Isotopes are atoms of the same element, so they always have the same number of protons. They differ only in the number of neutrons.
Why do isotopes of the same element have identical chemical properties?
Isotopes have the same number of electrons and therefore the same electronic configuration. Because chemical properties depend on the arrangement of electrons, isotopes react in the same way.
True or False?
Isotopes of the same element have identical physical properties because they are the same element.
False.
Isotopes have the same chemical properties, but different physical properties (such as density and melting point) because they have different masses — they contain different numbers of neutrons.
Relative atomic mass (A_r) is the ______ mass of an element's isotopes compared to 1/12th of the mass of a ______-12 atom.
Relative atomic mass (A_r) is the average mass of an element's isotopes compared to 1/12th of the mass of a carbon-12 atom.
Chlorine exists as Cl-35 (75%) and Cl-37 (25%). Calculate the relative atomic mass of chlorine.
A_r = $\frac{(75 \times 35) + (25 \times 37)}{100}$ = 35.5

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