anonymous
  • anonymous
Basic chem help
Chemistry
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
|dw:1357783219427:dw| i cant figure out how to do that part
matt101
  • matt101
Let me ask you a question...what is the mass (in amu) of hydrogen?
anonymous
  • anonymous
1.01?

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matt101
  • matt101
Right (let's say 1 amu). How did you get that number?
anonymous
  • anonymous
Periodic table I was wondering if the answer was a specific #, or just general, like 'same as the atmc #' or whatever
matt101
  • matt101
Oh, I see...well in that case... Take a look at helium then. Its atomic number is 2, but its mass is 4 amu. How do you explain the difference?
anonymous
  • anonymous
double? But thats not true for all, right?
anonymous
  • anonymous
*It might be close to it though
matt101
  • matt101
Right. In fact, you'll see for every element other than hydrogen that the mass is higher than the atomic number. I'll explain the answer to your original question. The atomic number, as you probably know, indicates the number of protons in that element. Protons have an atomic mass of 1 amu. The reason why the mass if often higher than the atomic number is that there are neutrons as well, which also have a mass of 1 amu. Electrons are said to have a mass of ~0 since they are far smaller than either protons or neutrons (less than 0.05% their mass, in fact). The reason the mass of hydrogen is the same as the atomic number is because it only has one proton in the nucleus and no neutrons.
anonymous
  • anonymous
Ohh.. i see what you mean.. So it would be like this?|dw:1357784390834:dw|
matt101
  • matt101
I would say ~0 since electrons still do have mass (though it's a very, very small number). You got it!
anonymous
  • anonymous
Ok, and what does ~0 mean.. really close to 0?
matt101
  • matt101
Approximately 0
anonymous
  • anonymous
Thanks!

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