An atom is the smallest characteristic unit of an element.
原子是元素最小的结构单位。
Ionized by energetic starlight, a hydrogen atom emits the characteristic red H-alpha light as its single electron is recaptured and transitions to lower energy states.
氢原子被高能的恒星光离子化之后，在它的单个电子重新被捕获并跃迁到低能级上时会放出典型的红色h - alpha光。
Atom: Smallest unit into which matter can be divided and still retain the characteristic properties of an element.
原子：元素的特征性质保持不变的最小物质单元，也是在不释放带电粒子的情况下物质能够分割的最小单元。
Atom: Smallest unit into which matter can be divided and still retain the characteristic properties of an element.
原子：元素的特征性质保持不变的最小物质单元，也是在不释放带电粒子的情况下物质能够分割的最小单元。
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