守恒定律是自然界中普遍成立的规律,是物理学中有效的思维方法.在核反应过程中,虽然发生了质量亏损,但都遵守电荷数守恒,质量数守恒,动量守恒和能量守恒;核碰撞中还遵守动量守恒和能量守恒.应用上述守恒定律是解决原子物理问题的主要依据和有效的思维方法.本文结合实例分类探析 The law of conservation is a law that is universally established in nature and is an effective method of thinking in physics. In the course of nuclear reactions, although quality losses occur, they all obey the conservation of charge numbers, conservation of mass numbers, conservation of momentum and conservation of energy; nuclear collisions Also observe the conservation of momentum and energy conservation. Applying the above conservation law is the main basis and effective thinking method for solving atomic physics problems.