A radioactive substance has a half-life period of 'T' years. The time taken for 6.25% of the original number of atoms to remain unchanged, when the substance has been undergoing decay is: 4T years.
What is an atom?
- A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.
- The fundamental building components of matter are atoms. Atoms make up anything that has mass and occupies space.
- The atomic mass, also known as the atomic weight, is the sum of the masses of the protons, neutrons, and electrons in an atom. In atomic mass units, the weight or mass of an atom is expressed.
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