Which of the following represents a pair of isotopes?
Atomic Number Mass Number
a. I 7 16
II 8 16
b. I 17 34
II 18 36
c. I 17 35
II 17 37
d. I 7 14
II 8 16
e. I 17 37
II 18 37
Hint: The atomic numbers of both must be the same if they are isotopes of the same element.
c
yufyidyi
Well, let's see here. Apparently, we're going on a hunt for isotopes. I hope they're not too elusive!
Looking at the options, it seems that the best option for a pair of isotopes is c. I 17 35 and II 17 37.
Why are they isotopes? Well, isotopes are atoms of the same element that have different numbers of neutrons, but the same number of protons. In this case, we have two atoms with the same atomic number (17), but different mass numbers (35 and 37) – voila, a pair of isotopes!
Now, just to clarify, these isotopes are like two peas in a pod – they share the same atomic number, but one of them has a little extra something (or, well, an extra neutron) in their mass number. They might not look exactly alike, but they're still part of the same element family.
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. To determine which of the pairs represents isotopes, we need to compare the atomic number and mass number of each pair.
Let's analyze each option:
a. I 7 16 and II 8 16
The atomic numbers are different (7 vs. 8), so these are different elements and not isotopes.
b. I 17 34 and II 18 36
The atomic numbers are different (17 vs. 18), so these are different elements and not isotopes.
c. I 17 35 and II 17 37
The atomic numbers are the same (17), and the difference in the mass numbers (35 vs. 37) indicates that these are isotopes of the same element.
d. I 7 14 and II 8 16
The atomic numbers are different (7 vs. 8), so these are different elements and not isotopes.
e. I 17 37 and II 18 37
The atomic numbers are different (17 vs. 18), so these are different elements and not isotopes.
The correct answer is Option c. I 17 35 and II 17 37, as they represent isotopes of the same element with the atomic number of 17.