Protons, Neutrons & Electrons in 7 Min

Name: Protons, Neutrons & Electrons in 7 Min | IB Chemistry S1.2 [IB1]
Description: IB Chemistry Structure 1.2, the nuclear atom: protons, neutrons and electrons (part 1 of 4, for SL and HL). The three particles with their relative masses and charges, what the gold foil experiment shows, atomic number and mass number, and how to count the particles in any atom or ion. Includes a six mark exam-style question solved step by step.

What you'll learn

IB Chemistry Structure 1.2, the nuclear atom: protons, neutrons and electrons (part 1 of 4, for SL and HL). The three particles with their relative masses and charges, what the gold foil experiment shows, atomic number and mass number, and how to count the particles in any atom or ion. Includes a six mark exam-style question solved step by step.

In this lesson

0:00The question
0:12Three particles, one tiny nucleus
1:20Atomic number and mass number
2:17Ions
3:04Practice: count the particles
4:11What earns the mark
4:52Exam question solved
5:53Recap
6:14Next Wednesday

Answers to the practice questions

12 protons and 12 neutrons [1]; 10 electrons [1].
Relative mass 1 and relative charge +1 [1].
Fluorine with mass number 19 [1] and a charge of 1− [1]: the fluoride ion, ¹⁹F⁻.

Try them at the end of the video first. Questions are original, in the style of the exam; marks are estimates.