Answers section
Questions 3.8b
- An atom X has 8 protons and 10 neutrons. What is its mass number?
- Element Y has 4 neutrons and a mass number of 7. Find its atomic number.
Answers to Questions 3.8b
- A nucleus is the combination of all protons and electrons at the centre of an atom or ion. An ion is a charged particle formed when an atom gains or loses outer electrons