BEFORE CLASS / PREPARATION 01
Small particles.
A big first step.
Meet the atom, read its numbers, and bring one thought to class.
10–15 minutes · No previous study needed这是本章第一个核心预习任务，不是整章预习。按老师指定的知识点完成。进度保存在本机，可下载记录与老师分享。中文提示随时可用，不影响完成。
STEP 1 / 6
Get ready
You do not need to know these words yet. We will introduce them before asking you to use them.
如果还没学过，跟着模型和例题走即可。学过的同学可以先练习，不确定时回来看看。
By the end, you will be able to:
- Locate protons, neutrons and electrons.
- Use atomic number and mass number.
- Explain why an atom is neutral in one English sentence.
This is preparation. You are allowed to be unsure; you do not need every answer right.
My work · 登录查看班级作业 ↗
For class tracking, open the assigned task from My work. / 需从“我的作业”打开老师布置的任务，再提交到班级。
All preparation tasks ↗
Weekend preparation → weekday recall
These short cards help you recall the model and words before class. They are not another copy of this activity.
Download 3 recall cards · PDF ↓