How many neutrons are there in an atom of ?

Question

How many neutrons are there in an atom of  ?

Quizplus · Accepted Answer

The atomic number of an element is the number of protons in its nucleus. In the given atom, the atomic number is 92 (indicated by the symbol 11ea8dfd_96db_c9a8_8f12_6f106d5042df_TB5806_11). The mass number of an atom is the total number of protons and neutrons in its nucleus. The symbol for this is usually written as A, so the given atom can be represented as A=235, Z=92. To find the number of neutrons, we subtract Z from A: N = A - Z = 235 - 92 = 143. Therefore, the correct answer is B) 143.

How Many Neutrons Are There in an Atom of