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Chem
| Term | Answer |
|---|---|
| Dmitri Mendeleev | Who's attributed with the idea of arranging the known elements of his time in a table according to their chemical and physical properties. |
| This scientist predicted that the empty spaces on his periodic table represented... | undiscovered elements |
| Henry Moseley | Who arranged the periodic table of elements in the order of atomic number? |
| The periodic law states there is a periodic repetition of physical and chemical properties of the elements ... | when they are arranged in order of increasing atomic number |
| The vertical columns of the periodic table are called | groups |
| Each period in the periodic table corresponds to | an energy level |
| What are valence electrons? | electrons found in the outermost energy level of atoms |
| The horizontal rows of the periodic table are called? | periods |
| What do elements in the same periodic group have in common? | Same valence configuration, same valence electrons, and similar chemical properties. |
| What do elements in the same periodic periods have in common? | Same number of occupied energy levels- principle energy levels (PEL). |
| How many elements are in a period in which only the s and p sub-levels are filled? | 8 |
| Identify the sub-levels in a period that contains 32 elements | s,p,d,f |
| The number of valence electrons in group 17 element is | 7 |
| For groups 13 through 18 the number of valence electrons is equal to | The group # minus 10 |
| For group two elements, which sub-level are the valence electrons located in? | S |
| Name the three classes of elements | metals, nonmetals, and metalloids |
| Lose electrons | metals |
| Gain electrons | nonmetals |
| dul, brittle | nonmetals |
| Good electrical conductors | metals |
| malleable, ductile | metals |
| Are not conductive | nonmetals |
| The most reactive group of nonmetals | group 17, halogens |
| This group is unreactive, and only found in pure form in nature | group 18, noble gases |
| The group's name means "basic" | group 2, alkaline earth metals |
| Group of metals contains groups 3-12 | groups 3-12, transition metals |
| Group contains the most reactive group of metals | groups 1, alkali metals |
| elements are found in the second row of the f-block elements | actinides |
| The class of elements have both metallic and nonmetallic properties | metalloids |
| Explain why atomic radius decreases going across the period left to right on the periodic table. | The # of energy levels remains the same. The number of protons increases in the nucleus of each successive element atom. This increases the positive nuclear charge - pulling electrons closer to the nucleus. |
| Choose the best reason that the atomic radius generally increases moving down a group of elements. | the number of occupied energy levels increases |
| Which of the following atoms is largest: nitrogen, phosphorous, or arsenic? | arsenic |
| Find phosphorus, sulfur, and chlorine on the periodic table. Which of these is the largest atom? | phosphorus |
| Which of the following atoms is smallest; nitrogen, oxygen, or fluorine? | Fluorine |
| Write a definition for ionization energy | energy required to remove an electron from an atom. |
| Which atom would it take more energy to remove its first electron, sodium or aluminum? | aluminum |
| As you move left to right across a period. the first ionization energies | increases |
| As you move from the top of a group to the bottom, the first ionization energies | decreases |
| Which of these elements have the highest ionization energy? aluminum, silicon, or phosphorus? | phosphorous |
| Why is the third ionization energy of magnesium so much greater than the second ionization energy? | Once the 1st two electrons are removed, mg will be left with a full octet for its outer energy level. |
| Which of these elements have the highest ionization energy? tin, arsenic, or sulfur | sulfur |
| List the following atoms in order of decreasing electronegativity , Cl, K, & Zn | Cl, Zn, K |
| What is the general trend of electronegativity as you go down the group on the periodic table? | Electronegativity decreases moving down a group on the periodic table. |
| What element is the most electronegative? | fluorine |
| do metals tend to have high or low electronegativites? | low |
| Which of the following is the smallest; a lithium atom, Li+ ion, or sodium atom? | Li + ion |
| what is the trend for reactivity for the alkali metal group? | Reactivity increases going down the group |
| The halogens group? | reactivity decreases going down the group |
Created by:
sadiesamson