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| What are the radioactive elements with numbers from 90 to 103 in the periodic table called? | the actinides
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| To which group do lithium and potassium belong? | alkali metals
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| Arogon, krypton, and xenon are? | noble gasses
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| A horizontal row of blocks in the periodic table is? | period
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| A vertical row of blocks in the periodic table is? | group
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| The elements that border the zigzag line in the periodic table is? | metalloids
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| The most reactive group of nonmeatals is? | halogens
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| A positive atom is known as? | cation
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| A negative ion is known as? | anion
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| The elements of group one are all known as? | alkali metals
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| study of the composition of maerials and the changes that materials undergo is? | chemistry
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| Technology is? | application of chemical principles to prodict events
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| Basic research is? | carried out for the sake of increasing knowledge
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| Applied research is? | caried out to solve a problem
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| A physical property may be investigated by | melting ice
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| Chemical properties | include changes that alter the identity ofasubstance
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| Two features that distinguish matter are | mass and volume
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| An example of an extensive physical property is | mass
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| The particles in a solid are? | packed closely together
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| Physical means can be used to separate | mixtures
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| the symbol for the metricunit used to measure mass is | g.
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| the metric unit that is closest to a dime is? | millimeter
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| standards are chosen because they | are reproducible in another laboratory
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| a testable statemant used for making predictions are carring out further experiments is a | hypothesis
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| the unit m^3 measures | volume
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| the symbol that representsthe measuredunit for volume is? | ml
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| the SI unit for time is? | second
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| how many minutes are in a week? | 10,080 min.
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| the number of significant figures in 210 is | 2
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| the number of significant figures in 10000000 | 1
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| nickle-60 has | 32 neutrons
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| phosphorus-33 contains | 18 neutrons
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| what is the atomic number for aluminum? | 13
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| atomic number indicates | the number of proton in the nucleus
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| the descovery of the electron resulted from | the cathode rays
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| what is the atomic number for aluminum | 13
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| what does 218 in polonium-218 represent | mass number
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| sulphur-34 contains | 18 neutrons
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| gamma rays are | electromagnetic waves
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| who called the atom "atom" | democritus
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| a quantum of electromagnetic energy is called | photon
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| the number of orbitals in d is | 5
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| the number of orbitals in s is | 2
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| the number of orbitals in p | 6
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| the SI offrequency of electromagnetic radiation is | hertz
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| part of the atom where electron can't be found is | nucleus
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| how many periods are their on the periodic table | 7
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| the atomic sublevel right below 4p is | 5s
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| asingle orbital in the 3rd lvl can hold | 2 electrons
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| atoms are ---- when they are combined | more stable
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| a covalent bond results when --- are shared | electron
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| if two covently bonded atoms are identical, the bond is | nonpolar covaleny
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| the electrons involved is the formation of a chemical bond are called | valence electrons
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| most chemical bonds are | partly ionic and partly covalent
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| a neutral group pf atoms held togethyer by covalent bond is a | molecule
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| an octct is equal to | 8
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| how many double bonds are in the lewis structure for hydrogen fluoride, HF | none
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| the electron-sea model of bonding represents | metallic bonding
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| example of a molecular formula | O2
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