A:中子数为20的氯原子:1720Cl
B:S2﹣的结构示意图:
C:四氯化碳的电子式:
D:乙醇的结构式:C2H6O
We have made a survey among 1,000 students from a middle school about their favorite food. students like fruits according to the form.
Kind of food
Chocolate
Banana
Cookie
Apple
Percentage(百分比)
Of the students
20%
30%
15%
?