Table Of Contents
1. Atomic number
4. Introduction to Atomic models and theories
4.1 Thomson’s model and its limitations
4.2 Rutherford’s model and its limitations
4.3 Bohr’s Model and its limitations
4.4 Practice question
Naturally occurring boron exists as two isotopes, B-10 with a relative abundance of 20% and B-11 with a relative abundance of 80%. How many electrons does each of the boron atoms contain?
Boron -10 Atomic number=4
Electrons =10-4 = 6 electrons
An atom is identified as platinum-195. What does the number represent?
Answer: The mass number of platinum.