Chemistry Homework Help: Identifying Metals and Anomalous Density in Elements

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Hybr!d
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Hey Guys. I got this question with these 6 elements in this table

Silver = Metal
Helium = Noble Gas
Hydrogen = Non Metal
Chlorine = Halogen
Lead = Metal
Sodium = Alkali Metal

Now the question says

Which of these are metals?

I answered: Silver, Lead

But I am wondering about Sodium can it be in the answer?

Also another question states:

Comparing the Density of the metals and non metals, Which element represents an anomaly? Why?

Density (g mL^-1)

Silver = 10.5
Helium = 0.00017
Hydrogen = 0.00008
Chlorine = 0.00291
Lead = 11.3
Sodium = 0.97

This question I don't clearly understand and I hope someone can help me!
 

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But I am wondering about Sodium can it be in the answer?
Sodium is a metal too.

Comparing the Density of the metals and non metals, Which element represents an anomaly? Why?

Density (g mL^-1)

Silver = 10.5
Helium = 0.00017
Hydrogen = 0.00008
Chlorine = 0.00291
Lead = 11.3
Sodium = 0.97

Metals:
Silver = 10.5
Lead = 11.3
Sodium = 0.97

Non metals:
Helium = 0.00017
Hydrogen = 0.00008
Chlorine = 0.00291

I don't see any anomality. Maybe they want you to answer sodium, but I don't see it as an anomality. It has a lower density than lead and silver because it has less protons and neutrons, which is the same to say mass, per unit of volume. I'm a beginner, I just tried to help. Wait for the experts.
 
Pponte Yeh I thought Sodium was a metal thanks for that but the last question is really bugging me.
 
PPonte said:
Metals:
Silver = 10.5
Lead = 11.3
Sodium = 0.97

Non metals:
Helium = 0.00017
Hydrogen = 0.00008
Chlorine = 0.00291

I don't see any anomality. Maybe they want you to answer sodium, but I don't see it as an anomality. It has a lower density than lead and silver because it has less protons and neutrons, which is the same to say mass, per unit of volume. I'm a beginner, I just tried to help. Wait for the experts.

Yes but because it has fewer electrons, protons and neutrons it must also have a smaller volume, which means that logically it's density shouldn't be that far off from the other metals but since it is, it is an anomaly.
 
Ahh thanks guys you are real champs..