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ch 17 notes
kramer ch 17 physics
Question | Answer |
---|---|
what are atoms? | atoms are building blocks of matter |
what are man made elements called ? | synthetic elements |
what are the five elements that make up living things? | oxygen,carbon,hydrogen,nitrogen and calcium |
which element is the lightest? | hydrogen is the lightest element |
what is a molecule? | is the smallest particle of a substance consisting of two or more atoms that bond together. |
what is a compound? | a subtance that is made of different elements combined in a fixed porportion |
what is the nucleus made of? | necleons which are building blocks of the neucleus |
what are protons and neutrons? | protons are electrically charged positve and neutrons are electrically neutral |
what are isotopes? | are atoms of the same element with different numbers of neutrons |
what is a covalent bond and an ionic bond? | a covalent bond is when two atoms share electrons and an ionic bond is when electrons are transferred between atoms |
what are isotopes ? | atoms that have the same element having different numbers of neutrons. |
what are the four states of matter ? | solid , liquid, gas, and plasma |
what is atomic mass number? | the total number of nucleons in the nucleus of an atom |
what is atomic number ? | the number of protons in the nucleus |
what percentage of the material on earth is fromed from a dozen elements ? | 99 percent |