The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is extremely small.
Explanation:
During the collision between two particles, a large force acts between the two colliding bodies for a relatively short time, also known as impulse.
Therefore, the principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is extremely small.
-- The atomic number is the number of protons in the nucleus. -- Each proton in the nucleus is usually matched by one electron in the 'cloud'. -- The addition of a proton OR a neutron increases the mass number by 1 . -- Electrons have such small mass that they don't figure into the atomic mass at all.
