Q3. what do you notice in the number of valence electrons of metals, non-metals, and noble gases? 18

Question 12 Exercise - Elements and Compounds

Answer:

Solution:

Metal	Symbol	Non-Metal	Symbol
Lithium	Li	Hydrogen	H
Beryllium	Be	Carbon	C
Sodium	Na	Nitrogen	N
Magnesium	Mg	Oxygen	O
Aluminium	Al	Fluorine	F
Potassium	K	Phosphorus	P
Calcium	Ca	Sulphur	S
		Chlorine	Cl

Metalloids	Symbol	Noble Gases	Symbol
Boron	B	Helium	He
Silicon	Si	Neon	Ne
		Argon	Ar

Video transcript

"hello friends welcome to lido's online homework traveling session today we'll be looking at the following question the question says give the names and the symbols of the first 20 elements of the periodic table and these 20 elements we have to differentiate them as metals non-metals metalloids and noble gases so friends here we can see this is a periodic table so from in the periodic table from one that is this one to 20 so all these elements from 1 to 20 we have to arrange them as metals non-metals metalloids and noble gases now let's look at it one by one now when i look at the periodic table out here let's see the first one the first one is hydrogen so hydrogen is basically a non-metal so we term it here under non-metal the next one is the second one that is helium helium is basically a noble gas then it is lithium beryllium and then lithium and beryllium both are metals then after that we have boron so this green part you can see it is a metalloid so here metalloid we are going to write boron then after boron we have carbon nitrogen oxygen chlorine phosphoryl and neon so all these from carbon to neon carbon to fluorine they are all non-metals so we have carbon nitrogen oxygen and chlorine which are there under non-metal screw then this neon so extreme right we all know that this all are noble gases so your neon will be under the heading of noble gases then after neon we have the 11th one that is sodium magnesium aluminium so sodium magnesium and aluminium all these are metals then we have silicon here silicon is actually metalloids silicon is metalloids and then we have phosphorus sulfur chlorine and argon to 18. so phosphorus sulfur and chlorine these are basically non-metals phosphorus sulfur and chlorine and extreme right are the noble gases so argon is the noble gas then as we are told to differentiate between first 20 elements the last one the second last is the potassium and the last one is calcium which is to the extreme left and we can term them as metals so this is how we differentiate between metals non-metals metalloids and noble gases this is the way we approach this question hope you understood the solution in case if you have any doubts please feel free to drop a comment below and subscribe to this channel for regular updates thank you "

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