Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

zaynahfBest ResponseYou've already chosen the best response.0
dw:1357783219427:dw i cant figure out how to do that part
 one year ago

matt101Best ResponseYou've already chosen the best response.1
Let me ask you a question...what is the mass (in amu) of hydrogen?
 one year ago

matt101Best ResponseYou've already chosen the best response.1
Right (let's say 1 amu). How did you get that number?
 one year ago

zaynahfBest ResponseYou've already chosen the best response.0
Periodic table I was wondering if the answer was a specific #, or just general, like 'same as the atmc #' or whatever
 one year ago

matt101Best ResponseYou've already chosen the best response.1
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?
 one year ago

zaynahfBest ResponseYou've already chosen the best response.0
double? But thats not true for all, right?
 one year ago

zaynahfBest ResponseYou've already chosen the best response.0
*It might be close to it though
 one year ago

matt101Best ResponseYou've already chosen the best response.1
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.
 one year ago

zaynahfBest ResponseYou've already chosen the best response.0
Ohh.. i see what you mean.. So it would be like this?dw:1357784390834:dw
 one year ago

matt101Best ResponseYou've already chosen the best response.1
I would say ~0 since electrons still do have mass (though it's a very, very small number). You got it!
 one year ago

zaynahfBest ResponseYou've already chosen the best response.0
Ok, and what does ~0 mean.. really close to 0?
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.