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Mendeleev arranged the elements based on _________________ in his periodic table.
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Elements are ordered according to _____________ on our periodic table.
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Ch. 5 - Tinder
The Periodic Table
| Question | Answer |
|---|---|
| Mendeleev arranged the elements based on _________________ in his periodic table. | the element's atomic mass |
| Elements are ordered according to _____________ on our periodic table. | an element's atomic number |
| Elements within the same group have the same number of _________. | valence electrons |
| The process of losing or gaining electrons is called _________. | ionization |
| Elements that share properties of both metals and nonmetals are called ________. | semiconductors |
| If elements belong to the same family, they often have a similar ___________. | appearance |
| Where are alkali metals located on the periodic table? | left-most column |
| What exists as single atoms rather than as molecules? | noble gases |
| Why are Group 18 noble gases relatively inert? | Their s and p orbitals are filled. |
| Silicon is not a semiconductor. True or False | False. Silicon IS a semiconductor. |
| What was so important about Mendeleev's periodic table? | He predicted new elements. |
| In the modern periodic table, elements appear at regular intervals if they have similar ________. | properties |
| A group's elements react similarly because of their ______________. | valence electrons |
| When an element's outermost energy levels are only partially filled, some elements are highly _______. | reactive |
| Elements that are usually shiny. | metals |
| Elements in a family in the periodic table have similar _____ and _______ properties. | physical and chemical |
| Which metals are located in the center of the periodic table? | transaction metals |
| What Group do noble gases belong to? | Group 18 |
| What is the name of elements that can conduct heat and electricity under certain conditions? | semiconductors or metalloids |
| When Mendeleev studied the properties of the elements, what was he looking for? | patterns |
| As you move from left to right across a period in the modern periodic table, what do you notice about the elements? | They become less metallic. |
| A filled outer s orbital results in a ________. | less reactive atom |
| Metals tend to be good conductors of heat. True or False? | True |
| Because Alkali metals have one valence electron that is easily removed to form a positive ion, they are extremely _____. | reactive |
| How do most halogens form compounds? | by gaining an electron to form a negative ion |
| How do copper or tungsten form compounds since they are transition metals? | losing electrons to form positive ions |
| Computers use a semiconductor ___________. | silicon |
| When properties were repeated in Mendeleev's periodic table, he started a new ___. | row |
| What does the periodic law state? | when elements are arranged by atomic number, elements with similar properties appear at regular intervals. |
| Which property, chemical or physical, is determined by the number of valence electrons? | chemical |
| What are nonmetals that do not conduct heat or electricity well called? | insulators |
| Metals are divided into 3 families based on the number of ______ they have. | valence electrons |
| What metals make up Group 1? | Alkali Metals |
| What are the reactive elements in Group 17 called? | valence electrons |
| What are not metals but have some properties of metals called? | semiconductors or metalloids |
| Why would a jeweler want to use metals in their work? | Metals are easily shaped and drawn into wires. Nonmetals aren't malleable or ductile. Metals are also shiny. |
| Why has the development of the periodic table been so important to chemists? | It is used to organize the elements by atomic number and properties. They can easily find elements with similar physical and chemical properties because they are in the same group or family. |
| Would you say semiconductors are opposite of conductors? | No. They are somewhat-but not entirely-like metals. Metals can conduct heat and electricity. Under certain circumstances, semiconductors can but not always. |
| What is the difference between and atom and a molecule? | Atom=smallest unit of an element Molecule=consists of 2 or more atoms |
| What is the definition of an ion? | An ion is a changed atom or molecule. |
| What type of charges do a cation and an anion have? | A cation has a positive charge; an anion has a negative charge. |
| Identify some examples of transition metals and their uses. | Gold, silver, platinum, copper, nickel, and zinc; Uses include wiring, jewelry, and as conductors of heat and electricity |
| How does the period law apply to halogens? | They have the same valence electrons (7) and similar chemical properties. |
| Differentiate alkali metals and alkaline-earth metals. Identify ways each are used. | Alkali metals-highly reactive, metallic elements. Alkaline-earth metals-less reactive. Alkali metals like sodium are found in compounds like sodium chloride. Alkaline-earth metals like calcium are found in limestone, building materials, and in our body |
| The majority of elements in the periodic table are noble gases or conductors? | conductors |
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