Metals and nonmetals chapter full video
Answers
ANSWER : there is no facility of avail video so I can differentiate between metals and non metals
METALS-
these are malleable
ductile
lusturous
sonorus
hard
high density
and good conductor of electricity
NON-METALS-
not malleable
not ductile
not sonorus
not shiny,lustorous
not hard
not high density
and poor conductor of electricity
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Explanation:
Element: Is a substance that can’t be broken into more simpler substances. Elements are classified into different categories:
�Metals
�Non Metals
�Metalloids
�Noble Gases
Metals
Metals are those elements which have 1,2 or 3 valence electrons in their valence shell.
Example : atomic no. of Na =11
Electronic confugration =2,8,1
They always loose electrons to form electropositive ions.
Na – 1electron ------Na +
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Non Metals
Non metals are those elements which have 4,5,6 or 7 valence electrons in their valence shell and they always gain electrons to form electronegative ions.
Cl(17) – 1 electron --------Cl-
Electronic Configuration = 2,8,7
2. ductility: process of drawing into thin wires
Metals:ductile
Non metals: nonductile because they are brittle
3. Electrical Conductivity And Thermal Conductivity:
Metals: good conductor of heat and electricity because of free mobile electrons in it.
Non metals: poor conductor of heat and electricity.
4. lustre: shine
Metals: lustrous
Non metals: non lustrous
5. Hardness:
Metals: hard
Non metals: soft
6. physical state:
Metals: solid at room temperature
Non metal: can be solid, liquid or gaseous
7. melting and boiling point:
Metals :high m.pt and b.pt
Non metals: low m.pt and b.pt
8. Sonority: when hit, they produce sound
Metals:sonorous
Non metal:non sonorous