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Atoms are composed of electrons, protons, and neutrons.
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Electrons are positively charged whereas protons are negative and neutrons are neutral.
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The atomic number indicates the number of protons plus the number of neutrons.
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Isotopes are different varieties of the same element. They differ in the number of neutrons they have.
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Electrons travel in paths called "orbitals" which occur at distinct energy levels or shells outside of the nucleus.
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| True / False |
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Valence electrons are the innermost electrons in an atom.
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Ionic bonds occur between either 2 positive or 2 negative atoms.
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In a covalent bond, atoms share outermost electrons to achieve stability.
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Neon is an example of a Halogen and it has achieved stability and so is unreactive.
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"Na" is the atomic symbol for sodium and "N" is the atomic symbol for nitrogen.
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| True / False |
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Examine this chemical reaction: A + B ---> C + D.
A and B are called products while C and D are called reactants.
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In the reaction, Mg + O -----> ?, the product is magnesium oxide.
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In the reaction: copper + sulfur + oxygen ---> ?, the product is copper oxide.
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Unlike non-metals, metals tend to be shiny, very brittle, and they are good conductors of electricity.
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The first ten elements of the periodic table in correct order are: H, He, Li, Be, B, C, N, O, F, Ne.
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| True / False |
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Unlike physical changes, chemical changes cannot be easily reversed.
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A burning match is an example of a chemical change.
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Tearing a piece of paper is an example of a physical change.
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The chemical formula for glucose is: C12H6O6.
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Glucose is a molecule made up of C, H, and O atoms joined together by chemical bonds.
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