Question

Atom Atomic # Mass #

A 100 257
B 101 257
C 101 260
D 102 259

Answer 1

The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element?

Answer 2

A and B
B and C
B and D
C and D

Answer 3

Do you know what isotopes are?

Answer 4

yea! i am making sure is the answer B and C?

Answer 5

If you know what isotopes are, it wouldn't be hard figuring it out right? What is the same in isotopes? And what is different between isotopes of the same element?

Answer 6

same chemical properties they differ in the nuclear properties

Answer 7

well yea they have the same chemical properties since the electron configuration is the same. but that's not important here.

The difference which is relevant for this question is the fact that isotopes have the same number of protons, and different number of neutrons. The atomic # is the same thing as the number of protons. When the number of neutrons differs, the mass automatically differs too. So as you can see B and C have the same atomic number, but different mass.

Answer 8

oh i see. Thank you!

Answer 9

No problemo :)
Good luck with the rest of your questions.

Answer 10

thanks