Comments on: O Level Chemistry – Periodic Table Mini Series (Part I)

By: Unknown

Unknown — Sat, 01 Aug 2009 08:27:10 +0000

I’d like to clarify some inquiries on my part. For question one, Boron is a metalloid with the properties of both metals and non-metals. Does this mean that Boron is 100% metal ? Moreover, for question 2, it really got me wondering why Ag does not have one outer most shell electron. It is known that Ag(I) has 1 valence electron. In addtion, if Ag has more than 1 valence electron, say 2 electrons, wouldn’t the product of the reaction with the chloride ion be AgCl(subscript 2) instead of AgCl ?

By: rija

rija — Tue, 05 May 2009 19:15:40 +0000

Q2 ans is indeed a,but i am confused in Q1 statement…..

By: rija

rija — Tue, 05 May 2009 19:13:41 +0000

it is mentioned in question that both are in group 3,and we know from group 1-3 all are metals then why option a cannot be correct?

By: harn

harn — Sat, 25 Apr 2009 13:11:59 +0000

This might sound a bit dumb but i am a bit confused by question 2. I thought all Group 1 metals will have only one outermost shell electron and since silver also has only one outermost shell electron, how will this be not typical of Group 1 metals?

By: sean

sean — Fri, 24 Apr 2009 04:01:43 +0000

Hi Kwee,

Let us check your reasonings:

Question 1:

Good. Dividing Line shows the B is a non-metal while Al is a metal

Aluminium forms Amphoteric Oxides, for your information.

No TWO elements can have the same proton number.

Answer is indeed (B) since both are in Group III and they have 3 valence electrons.

Question 2:

Silver is a metal – and all metals conduct electricity

Silver tends to form Ag+ cations and thus forms AgCl

Silver is very low in the Metals Reactivity Series, thus it will not displace hydrogen from steam.

Answer is indeed (A)!

Look forward to more of your participation,
Sean Chua
Master Trainer & Author
WINNERS Education Group

“Experience Learning with A Difference”