April 20, 2024, 05:01:26 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: 2k electrons and 2l electrons  (Read 3318 times)

0 Members and 1 Guest are viewing this topic.

Offline chay722

  • Regular Member
  • ***
  • Posts: 52
  • Mole Snacks: +0/-3
2k electrons and 2l electrons
« on: March 12, 2008, 08:58:25 PM »
An atom of the element beryllium consists of 4 protons, 5 neutrons, 2K electrons, and 2 L electrons. The atomic mass of this atom is
a) 13
b) 9
c) 5
d) 4

I am unsure of what they mean by 2K electrons and 2 L electrons? Could anyone explain please?
Logged

Offline ARGOS++

  • Sr. Member
  • *****
  • Posts: 1489
  • Mole Snacks: +199/-56
  • Gender: Male
Re: 2k electrons and 2l electrons
« Reply #1 on: March 12, 2008, 09:10:47 PM »

Dear Chay722;

K, L, M, etc are the “names” of the 'shells'.

I hope it may be of help.

Good Luck!
                    ARGOS++
Logged

Offline Arkcon

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7367
  • Mole Snacks: +533/-147
Re: 2k electrons and 2l electrons
« Reply #2 on: March 12, 2008, 09:38:51 PM »
And you know how much an electron weighs, relative to a proton or neutron, right?  Look it up, it will help you a lot with these problems.
Logged
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline Yggdrasil

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3215
  • Mole Snacks: +485/-21
  • Gender: Male
  • Physical Biochemist
Re: 2k electrons and 2l electrons
« Reply #3 on: March 15, 2008, 02:30:15 PM »
K and L are notations that are mostly outdated (I think).  K electrons are electrons in the first energy level (principle quantum number n=1) and L electrons are electrons in the second energy level (n=2).
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links