Which of the following statements is true concerning and ?
A) They have the same number of neutrons.
B) They are isotopes.
C) They have the same relative atomic mass.
D) They have the same mass number.
E) They have different chemical properties.

Question

Which of the following statements is true concerning  and  ?
A) They have the same number of neutrons. 
B) They are isotopes. 
C) They have the same relative atomic mass. 
D) They have the same mass number. 
E) They have different chemical properties.

Quizplus · Accepted Answer

The two atoms have the same atomic number (number of protons), indicated by the identical first part of their names (11eac9a9_4c0b_0d1e_acc3_ and 11eac9a9_4c0b_0d1f_acc3_). However, they have different mass numbers (the sum of protons and neutrons), indicated by the different numbers at the end of their names (adc71f7de82d_TB7480_11 and 490f1d625c0e_TB7480_11). Therefore, they are isotopes. Isotopes of an element have the same number of protons, but can have different numbers of neutrons, resulting in different mass numbers.

Which of the Following Statements Is True Concerning and