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Atoms were first discovered by Maharishi Kannada when he was eating food and he saw that it could be broken into parts. Later, the credit goes to Democritus, a Greek philosopher who explained the whole theory well

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Ions
Ions are atoms with a charge.
atoms with positive charge have one or more extra electrons.
atoms with negative charge have a less number of electrons.

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Atoms are the smallest particle of a element and may or may not have independence exictence

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Radicals were not taught in grade 6

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molecules are formed when atoms 2 or more atoms come together forms a molecule. it has a independent existence.

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atoms are the smallest unit possible they might not have independent existence
molecules are independent unit they are made up of atom

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1) Atoms - are the smallest unit of matter made up of neutrons, electrons, protons.
2) Molecules - smallest particle of pure substances
3) Radicals - Group of atoms from different elements (extra reading).
4) History about atoms - don't know

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Molecules are the smallest part of matter.
Atoms make up molecules to get independant existance and radicals are electrons protons neutrons which make up atoms.Electrons are negitively charged,protons are positively charged and neutrons are neuter. Extra reading:
Ions are divided in to types Kations and Anions Kations are positve and anions are negitive .
when we remove or add power to chemical formulas we say there are ions.
Molecules were first known to be the smallest part of matter but then john Dalton and another indian philospher from kannada came with the term atoms.

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atoms are the smallest unit of matter that may or may not have individual existence.
they are made up of sub atomic particles. the sub atomic particles are proton neutron and electron. protons have a positive charge and electrons have a negative charge and neutrons have no charge. molecules are the smallest unit of matter which will have independent existence.
ions are charged particles of a substance. they can have a positive or negative charge

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Atoms are the smallest unit which may or may not have independant existence. They consist of electrons, protons, and neutrons.

Earlier it was thought everything was made of earth water air and fire, but then an indian scientist kannada and an english scientist John Dalton discovered that everything is actually made of elements and compounds which are made out of atoms, atoms were called 'Anu' at first

Molecules are the smallest unit which have independant existence, they consist of atoms.
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atoms are the smallest unit of matter. the consist of nuetrons, electrons and protons. they make the nucleus of the atom

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Atoms are the smallest possible units of matter that may or may not have an independent existence. Molecules are the smallest units of matter which always have an independent existence

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Atoms may or may not  have an independent existence
Two atoms make a molecule
Molecules have independent existence
Both atoms and molecules are impossible to see by naked eyes or an ordinary microscope

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1) Atoms- Atoms are the smallest possible unit of matter that exhibits all the properties of that kind of matter. It may or may not have independent existence. It is made up of electrons, protons and neutrons. Atoms was discovered first by Kannada (Indian philosopher) and later by John Dalton.
2) Molecules- Molecules are the smallest unit of matter that exhibits all the properties of that kind of matter . It has independent existence. It is made up of two or more atoms.

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atoms are smallest unit of matter they may or may not have independent existence
molecules-
they are the smallest unit and have independent existence

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Atoms are the smallest unit of matter that may or may not have independent existence.
Molecules are the smallest unit of compounds , element or mixtures that exhibits all its properties and has an independent existence.

I have no knowledge about radicals as not taught last year.

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atoms are made up of neutrons, protons and electrons. The nucleus of an atom is made up of protons and neutrons. Electrons circle the nucleus in the electron cloud.