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| Real atoms are not too tiny. |
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| You can only see atoms under a very special microscope. |
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| Atoms can be cut. |
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| Atom means indivisible, which means it can't be divided further or can't be cut further. |
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| Everything you see around you is made up of atoms. |
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| Everything is made up of molecules, but all molecules are not made up of atoms. |
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| Atoms are the smallest units of everything. |
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| Water is made up of water molecules, but it is also made up of atoms. |
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| There are two atoms of hydrogen and two atoms of oxygen in each water molecule. |
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| When molecules join together, they form an atom and when atoms join together, they form a thing. |
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| In the center of an atom there is the nucleus and it's made up of even smaller parts. |
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| The smaller parts of the nucleus are called electrons and neutrons. |
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| Each proton of the nucleus carries a negative electrical charge. |
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| The neutrons don't carry any electrical charge, like protons. |
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| The nucleus of an atom has a positive charge due to the protons. |
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| Electrons are outside the nucleus; they are orbiting around the nucleus. |
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| Electrons carry a positive charge. |
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| The total negative charge of electrons is equal to the positive charge of the nucleus. |
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| An atom is neutral: the positive charge of the protons is neutralized by the negative charge of the electrons. |
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| The electrons are moving outside the nucleus at a very slow speed. |
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| Electrons can run away from the nucleus. |
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| Every atom has the same number of protons, electrons and neutrons. |
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| Electrons keep moving in shells outside the nucleus. |
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| Each shell contains an unfixed number of electrons. |
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| The first shell can have two electrons and the third can have eight electrons. |
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| The third shell can hold eighteen eletrons. |
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| The fourth shell can hold up to thirty-two eletrons. |
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| The outermost shell is called the valence electron. |
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| Atoms bond with other atoms to form a molecule with the valence electrons in the valence shell. |
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| Atoms always keep trying to fill their shells. |
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| An oxygen atom has eight electrons in its second shell. |
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| A hydrogen atom has only one electron in its outer shell. |
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