IB MYP Integrated Sciences e-Assessment : Atomic structure Exam Style Practice Questions - New Syllabus
Question (1 marks)
The strong magnets in this investigation are made from element neodymium.
Using the information from the image , state the number of protons , neutrons and electrons in an atom of neodymium.
▶️Answer/Explanation
Ans:
Atomic Number: 60
Relative Atomic Mass: 144
1. Protons: 60 (Equal to the atomic number)
2. Electrons: 60 (In a neutral atom, electrons = protons)
3. Neutrons:
$
\text{Neutrons} = \text{Relative Atomic Mass} – \text{Atomic Number}
$
$
\text{Neutrons} = 144 – 60 = 84
$