Isotopes of an element differ in that they have the same number of
[ Select ]
neutrons
protons
but different numbers of
[ Select ]
neutrons
protons
.

Question

Isotopes of an element differ in that they have the same number of 
[ Select ]
neutrons
protons
 but different numbers of 
[ Select ]
neutrons
protons
 .

BlackTom AI · Accepted Answer

To understand isotopes, start from the basic idea: isotopes are variants of the same element that share the same atomic number but differ in mass due to a different number of neutrons.

First dropdown consideration: If we fill in 'protons' for the first blank, the statement reads: 'Isotopes of an element differ in that they have the same number of protons but different numbers of neutrons.' This aligns with the defining feature of isotopes: the identity of the element is determined by the number of protons, while the neutrons can vary, leading to different mass numbers.

Second dropdown consideration: For the second blank, the natural completion is 'neutrons': 'Isotopes differ in the number of neutrons.' This is exactly what causes the mass difference among isotopes of the same element, without changing the element’s chemical properties that depend on proton count.

Why the alternative pairings would be incorrect:
- If we swapped the first blank to 'neutrons' (i.e., 'same number of neutrons but different numbers of protons'), the statement would imply different elements (since protons define the element), not isotopes, which contradicts the very definition of isotopes.
- If we swapped the second blank to 'protons' (i.e., 'different numbers of protons'), that would again describe different elements, not isotopes, and would violate the concept that isotopes are the same element.

In summary, the intended and scientifically accurate completion is: the same number of protons and different numbers of neutrons. The reasoning rests on the distinction between atomic number (protons) defining the element, and neutron count affecting mass without changing chemical identity.

Isotopes of an element differ in that they have the same number of [ Select ] neutrons protons but different numbers of [ Select ] neutrons protons .多重下拉选择题

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