Characteristics of Metals and Non Metals:
A metal is a chemical element whose atoms readily lose electrons to form positive ions (cations), and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms. Non-Metal is a chemical element lacking typical metallic properties.Watch Characteristics of Metals and Non Metals to learn more.
Metals and Non Metals:
- Nonmetals vary greatly in apperance • Nonmetals tend to gain electrons when they react with metals • Compounds composed entirely of nonmetals are molecular substances • Most nonmetal oxides are acidic • Hydrogen is a nonmetal however it has metallic properties under great pressure • Oxygen group: oxygen is a colorless gas all others are solid • Halogens, a group of nonmetals are very reactive means salt formers • Noble gases unreative nonmetals PROPERTIES OF METALLOIDS • Intermiedate characteristics of metals and nonmetals • For example silicon looks like a metal but is brittle and a poor conducter of heat and electrity • Are important for semiconductors in computer chips.
• Alkali metals soft metallic substances all have metallic properties • Alkali means “ashes” • Certain metals like potassium and sodium are essential for human health • They have low densities and melting points • All alkali metals are extremely reactive • Stored in hydrocarbon to keep them from reacting
ALKALINE EARTH METALS
• Solid at room temperature • Typical metal properties • Harder and more dense than alkali metals and have higher melting points • Ionization energies are low • Berylium and Magnesium are lightest and least reactive of the group PROPERTIES AND TRENDS OF SELECT NONMETALS ×Hydrogen -1s^2 electron configuration – Doesn’t belong in any particular group – Is a nonmetal, but can be metallic under tremendous pressures – The ionization energy of hydrogen is marked higher than that of any alkali metals ×Oxygen Group – Has nonmetals, a metal, and a metalloid in it
PROPERTIES AND TRENDS OF SELECT NONMETALS ×Noble Gases
-All nonmetals are monatomic – Are not reactive -Have filled s and p subshells -Possess stable electron configurations – There are a few rare compounds of noble gases ×Halogens – “salt formers” _ Typical nonmetals – Melthing and boiling points increase with atomic number -Have highly negative electron affinities -Tend to gaiin electrons -Very soluable in water and dissolve to form the hydrohalic acids
Useful for CBSE, ICSE, NCERT & International Students
Grade : 8
Subject : Chemistry
Lesson : Metals and Non Metals
Topic: Characteristics of Metals and Non Metals
Visit www.oztern.com to find personalized test preparation solutions for Pre Medical – AIPMT, AIIMS, JIPMER, State, Pre Engineering – IIT JEE, JEE MAIN, BITSAT, State and Foundations – Class 6 to 10.