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Proton, Neutron and Electron are the subatomic particles of an atom. Proton and Neutron are both located in the nucleus while electrons surrounds the nucleus. Proton has a positive charge, electron has a negative charge and a neutron has a net charge of 0.

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Proton, Neutron and Electron are the subatomic particles of an atom. Proton and Neutron are both located in the nucleus while electrons surrounds the nucleus. Proton has a positive charge, electron has a negative charge and a neutron has a net charge of 0.

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 Milk dissolve in hot water but some of its particles can be seen. This mixture is a type of colloid.

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 Milk dissolve in hot water but some of its particles can be seen. This mixture is a type of colloid.

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The mixture of oil and water is one common example of heterogeneous mixture. Bot oil and water have different polarity so technically its particles are visible when combined.

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The mixture of oil and water is one common example of heterogeneous mixture. Bot oil and water have different polarity so technically its particles are visible when combined.

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Both Sugar and Salt are fine example of Pure substances 

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Both Sugar and Salt are fine example of Pure substances 

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For the whole week, the lesson was about Pure substance, mixtures, compounds, atoms, elements and symbols, periodic table of elements and isotopes. I learned that pure substances are of definite composition like salt and sugar. An element is composed of only 1 type of atom while a compound is made up one or more elements such as Sodium Chloride(NaCl). A mixture can be either homogeneous - where the materials being mixed is not visible in the naked eye - or heterogeneous -where the different  materials being combined are visible.
The atom in one element differ from one element to another. There are three subatomic particles located in an atom and are named proton, electron and neutron. The atomic number of an atom depends on the number of protons present while the mass number depends on the presence of protons and neutrons in an atom. Lastly, I learned that an element, say for example Chlorine, can have  a different mass number even if it is just two the same element and that is called an isotope.