CHAPTER 5 METALS VS. NONMETALS

METALS  Metals are elements found to the left of the stair step line.  Metals are good conductors of heat and electricity.  Metals are solid at room temperature except Mercury (Hg)  Metals reflect light which is a property called luster.  Metals are malleable, which means they can be hammered or rolled into thin sheets.  Metals are ductile, which means they can be drawn into wires.

PROPERTIES OF METALS Metals-PhysicalMetals- Chemical Good conductors of heat and electricity Easily lose electrons (form cations (+) ions) Luster (shininess)Corrodes easily High densityReactive High melting point Examples of Cations Ductile and MalleableNa +, Mg 2+, Al 3+ Solid at STP (except Hg)

ALKALI METALS  Group 1 on the periodic table.  Good conductors, shiny, malleable, and ductile  Softer than most metals.  Most reactive of all metals- Reacts violently with water (H 2 O) and oxygen (O)  Readily combine with other elements and don’t occur in nature by themselves.  Each atom has 1 ve- in its outer energy level.  This e- is given up when it combines with a nonmetal, thus making it a 1 + cation charge.  Electron configuration ends in Xs 1

ALKALINE EARTH METALS  Make up group 2 of the periodic table  Shiny, malleable, and ductile  Not found as free elements in nature, because they combine so readily with other elements.  Each atom has 2 e- in its outer energy level.  These 2ve- are given up when they combine with a nonmetal, thus making it a cation with a 2+ charge.  Electron configuration ends in Xs 2

WHY ARE BOTH HYDROGEN AND CESIUM S- BLOCK ELEMENTS, WHEN HYDROGEN HAS ONE ELECTRON AND CESIUM HAS 55? A.All blocks contain at least one element from each period. B.Blocks of elements on the periodic table are based only on an element's valence electrons. C.The s-block includes only the most reactive elements. D.They have identical electron configurations.

 Atoms of elements in group 2 have ____________. A.one electron in their outermost energy level B.two electrons in their outermost energy level C.seven electrons in their outermost energy level D.eight electrons in their outermost energy level

PHYSICAL PROPERTIES OF NONMETALS  Elements that usually are gases or brittle solids at room temperature  Solids- Brittle, powdery, are not malleable or ductile  Do not conduct heat or electricity well  No luster- Dull  Found to the right side of the stair step line

CHEMICAL PROPERTIES IN NONMETALS  The e- in most nonmetals are strongly attracted to the nucleus of atoms.  Form ionic and covalent compounds  When Nonmetals Gain e- from metals. They form ionic compounds.  When 2 nonmetals share electrons with other nonmetals and they combine they form covalent bonds or molecular compounds.

PROPERTIES OF NON METALS Non Metals-Physical Non Metals- Chemical No luster (dull) often coloredTends to gain electrons from metals to form ionic bonds Poor conductors of heat and electricity Share electrons with other nonmetals to form Low Density Low Boiling Point molecules or covalent compounds Non Ductile and MalleableReactivity increases upward BrittleF is the most active

HALOGENS  Group 17- Form Halide compounds  Very reactive in their elemental form, but their compounds have many uses  Gains 1e- from metals to form ionic compound  F is the most chemically active of all the elements  Exist as diatomic molecules  Electron configuration ends in Xs 2 Xp 5

NOBLE GASES  ALWAYS exist as ISOLATED ATOMS  They are stable because their most outer energy levels is full with 8e-  Helium has 2ve-, but its 1 st energy level is still full  They are colorless, odorless, and tasteless.  They are sometimes called inert gases because they rarely take part in a chemical reaction.  Electron configuration ends in Xs 2 Xp 6

 Atoms of elements in group 17 have ____________. A.one electron in their outermost energy level B.two electrons in their outermost energy level C.seven electrons in their outermost energy level D.eight electrons in their outermost energy level

 Which of the following is incorrect in regards to group 18 Noble Gases? A.Has 8 valence electrons and has a full outer energy level. B.Does not bond with other elements on the periodic table. C.Likes to gain and receive electrons. D. Has an outer electron configuration of Xs 2 Xp 6

PROPERTIES OF METALLOIDS  Have properties of both metals and nonmetals. Solids Shiny or dull Ductile Malleable Conduct better than nonmetals but not as well as metals.

 Which of the following are poor conductors of heat and electricity? A.Metals B.Metalloids C.Nonmetals D.alkaline earth elements