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| the periodic table is made of? | periods and groups.
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| what are the two main sections of the periodic table? | metals and nonmetals.
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| metal is an element that? | is a good electrical conductor and a good heat conductor.
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| what metal is a liquid at room temperature? | mercury.
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| boiling point of copper? | 2567 degreees celsius.
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| many nonmetals are what at room temperature? | gases.
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| phosphorus is one of the how many solid nonmetals? | five.
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| metalloids have some characteristics of what and what? | metals and nonmetals.
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| the study of the compositon, structure, and properties of matter is? | chemistry.
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| all matter has? | mass.
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| a logical approach to solving problems that len themselves to investigation? | the scientific method.
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| testable statement that serves as the basis for predicitions and experiments? | hypothesis.
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| mesurements for science? | SI system.
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| weight is a measure of what on matter? | gravitational pull.
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| density is the ratio of what to what? | mass to volume.
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| what is used to convert from one unit to another? | conversion factors.
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| what is the closeness of a measurement to the correct or accepted value? | accuracy.
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| difference between the experimental value and the accepted value? | percentage error.
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| all digits known with certainty plus one final digit, which is uncertain is? | significant figures.
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| what factors are completely certain? | conversion factors.
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| atoms have been around since the time of? | ancient greeks.
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| who proposed the scientific theory of atoms? | John Dalton.
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| matter and mass cannot be what in chemical reactions? | created or destroyed.
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| cathode-rays supplied evidence of? | electrons.
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| what are negatively charged subatomic particles? | electrons.
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| Rutherford found evidence of? | atomic nucleus.
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| how did rutherord find atomic nucleus? | bombarding metal foil with a beam of positively charged particles.
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| atomic nuclei are composed of? | protons.
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| atomic number of an element is equal to? | number of protons of an atom of that element.
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| the mass number is equal to? | the total number of protons and neutrons in the nucleus.
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| what is the total number of electrons need to fill the first two main energy levels? | 10.
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| atomic sublevel with the nest highest energy after 4p is? | 5s.
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| because excited hydrogen atoms always produce the same line-emission spectrum, scientists concluded that hydrogen? | released photons of only certain energies.
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| number of orbitals for the d sublevel is? | 5.
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| emission of electrons from metals that have absorbed photons is called the? | photoelectric effect.
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| main energy levels of an aom are indicated by? | principal quantum numbers.
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| main energy level that can hold only 2 electrons? | first.
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| one of the wave properties of electromagentic radiation, such as light, is? | frequency
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| in SI, the frequency of electromagnetic radiation is measured in? | hertz.
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| for the f sublevel, the number of orbitals is? | 7.
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| Mendeleev noticed the properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing? | atomic mass.
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| what are the radioactive elements with atomic numbers from 90 to 103 in the periodic table called? | actinides.
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| the discovery of noble gases changed mendeleev's periodic table by adding a new? | group.
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| what are the elements with atomic numbers from 58 to 71 in the periodic table called? | lanthanides.
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| to which group do potassium and lithium belong? | alkali metals.
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| elements in a group or column in the periodic table can be expected to have similar? | properties.
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| mendeleev predicted that the spaces in his periodic table represented? | undiscovered elements.
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| in the modern periodic table, elements are ordered according to? | increasing atomic number.
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| the most useful source of general information about the elements for anyone associated with chemistry is a? | periodic table.
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| argon, krypton, and xenon are? | noble gases.
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| a mutual attraction between the nuclei and valence electrons of different atoms that bind the atoms together is called a(n)? | chemical bond.
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| the elements involved in the formation of a chemical bond are called? | valence electrons.
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| atoms are ____ when they are combined? | more stable.
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| the chemical bond formed when two atoms share electrons is called a(n)? | covalent bond.
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| if two covalently bonded atoms are identical, the bond is? | nonpolar covalent.
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| when atoms share electrons, the electrical attraction of an atom for the electrons is called the atom's? | electronegativity.
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| if the atoms that share electrons have an unequal attraction for the electrons, the bond is called? | polar.
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| a covalent bond results when ___ are shared? | electrons.
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| a neutral group of atoms held together by covalent bonds is a? | molecule.
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| a ___ shows the types and numbers of of atoms joined in a single molecule of a molecular compound? | molecular formula.
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