Question

here is some information about four atoms:
atom A: 3 electrons ,mass number 7
atom B: 142 neutrons, mass number 232
atom C: 3 neutrons ,mass number 6
atom D: 5 electrons, mass number 11
i. which elements are A,B,C and D?
ii. which pair of atoms are isotopes?​

Answer 1

Answer:

atom A is lithium. atom C is also lithium. atom D is boron. atom c is thorium.

isotopes are atom A and atom C