Question

list of key points to remember in the lesson metal and non metals​

Answer 1

Explanation:

$\huge \bf \blue{answer}$

$\huge \bf \fbox \green{metals}$

• Metals are those elements which have 1,2 or 3 valence electrons in their valence shell.

• Example : atomic no. of Na =11
• Example : atomic no. of Na =11Electronic confugration =2,8,1
• Example : atomic no. of Na =11Electronic confugration =2,8,1They always loose electrons to form electropositive ions.
• Na – 1electron ------Na +

• Na – 1electron ------Na +Electronic Configuration = 2,8,7

$\huge \bf \fbox \green{non \: metls}$

• 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.
• 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.

• 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

• Electronic Configuration = 2,8,7

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