ELEMENTAL CHEMISTRY PRESENTED BY GUO CHENG GUANG（aged 11)(001-01-03)

11岁郭承光用英文开讲：大学化学----元素化学逐一精通（001-01-03）

主讲： 郭承光（11岁，育民小学五年级）

助讲： 郭承曦（8岁，育民小学二年级）

LECTURER:

GUO CHENG GUANG (11 years old, Primary 5 from YUMIN Primary School)

GUO CHENGXI( 8 years old, Primary 2 from YUMIN Primary School)

content: periodicity, periodic of property

Wechat: Go-Singapore

E-mail: talentguo001@gmail.com