How many neutrons are in each neutral potassium-40 atom?
Mass # of lead-206?
# of protons of lead-206?
# of neutrons of lead-206
# of electrons of lead-206?
How much of an 89.6-mg sample Polonium-218 would remain after 9.15 minutes?
How many half-lives have passed for Polonium-218 after 9.15 minutes?
How many half lives have passed for Bi-210 after 10.02 days?
How much of a 64.0-mg sample Bi-210 would remain after 10.02 days?
Thank-you
2007-04-23 17:03:32 · 2 answers · asked by Amber H 1 in Science & Mathematics ➔ Chemistry
21 neutrons in K-40
Mass # of lead-206 is 206 amu
82 protons and electrons, 124 neutrons.
Data required for the rest
2007-04-23 20:08:09 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋
It is indeed Itsu in Piccadilly. You should not have any concerns on health grounds about eating here. Polonium 201 emits radiation that not only has a very short range, but cannot penetrate even a flimsy physical barrier e.g. clothing, or even skin (this means that it can be taken through an airport security scanner when it is sealed properly without detection). However it does penetrate and damage human tissue if swallowed, as the ex KGB agent so sadly experienced, and it is highly toxic. In theory it could enter through a cut in the skin, but remember that the radiation has only a short effective range even if you were exposed.. If there are any traces left at Itsu they will have been cleaned up after the investigation, and would not constitute a health hazard.
2016-04-01 04:31:38 · answer #2 · answered by Anonymous · 0⤊ 0⤋