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- I took a sea shell and broke it in half to find out thateverything is made up into tiny bits, which are called atoms. These atoms are indestructible.
- Democritus400 B.C.E
- All matter is made up of atoms, which are tiny, indivisible particles . All the atoms of an element have the same size, mass, and properties but the atoms of different elements have different sizes and masses. Atoms cannot be created, destroyed, or divided into smaller particles.
- John Dalton1803
- Thallium is a soft gray post-transition metal is not found free in nature. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores.
- sir william crooke1861
- Ernest Rutherford
- atoms are like solar systems with electrons orbiting around a massive nucleus, and as mostly empty space, with the nucleus occupying only a very small part of the atom
- polonium is a radioactive metal occurring in nature only as a product of radioactive decay of uranium.
- Marie Curie
- James Chadwick
- a newtron is is equal to the force that would give a mass of one kilogram an acceleration of one metre per second per second, and is equivalent to 100,000 dynes.
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