-----+--++++++++++!!!!!
Attachments:
Answers
Answered by
1
1.
( a ) 3 ( + 3 )
( b ) P and Q are metals, S is a non metal, R is a metalloid.
( c ) P
2. The valency of an atom is equal to the number of electrons in the last shell if the number is or less than 4.
( If more than 4 than the valency is equal to 8 minus the number of electrons in the last shell.)
So if you know the number of electrons, you can easily calculate the valency.
3.
Arranging them in increasing order :-
• 152
• 186
• 231
• 246
• 262
a) Smallest atom is the Lithium while the largest atom is Caesium.
b) The atomic size increases while going down a group because new shells are being added at each step.
4. Metalloids are elements that exhibits both the properties of Metals and non metals.
eg. silicon , boron.
I hope i have helped.
( a ) 3 ( + 3 )
( b ) P and Q are metals, S is a non metal, R is a metalloid.
( c ) P
2. The valency of an atom is equal to the number of electrons in the last shell if the number is or less than 4.
( If more than 4 than the valency is equal to 8 minus the number of electrons in the last shell.)
So if you know the number of electrons, you can easily calculate the valency.
3.
Arranging them in increasing order :-
• 152
• 186
• 231
• 246
• 262
a) Smallest atom is the Lithium while the largest atom is Caesium.
b) The atomic size increases while going down a group because new shells are being added at each step.
4. Metalloids are elements that exhibits both the properties of Metals and non metals.
eg. silicon , boron.
I hope i have helped.
Similar questions