1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Chemistry Homework Help

  1. Mar 4, 2006 #1
    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 dont clearly understand and I hope someone can help me!!
  2. jcsd
  3. Mar 4, 2006 #2
    Sodium is a metal too.

    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.
  4. Mar 4, 2006 #3
    Pponte Yeh I thought Sodium was a metal thanks for that but the last question is really bugging me.
  5. Mar 4, 2006 #4
    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.
  6. Mar 4, 2006 #5
    Ahh thanks guys you are real champs..
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook