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chemical help

The original poster: This account has been disbanded Views: 256 Replies: 26 Posted in: 2012-03-19 20:14:03
This account has been disbanded
For what short period are the number of neutrons and the number of protons equal? I really don't want to post a question, but I feel like there's something wrong with it. well
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Replies (26)

positive sequence reverse order
Perfect @Creation 2floor
What grade level are these questions...
2012-03-19 20:18:56
Rogue Master@King of Power 3floor
Liberal arts student passing by >>>>>
2012-03-19 20:21:11
Shirakami 4floor
Gao Yi passed by.
2012-03-19 20:22:10
Perfect @Creation 5floor
I'm not sure if silicon is in the third period and the fourth main group.
2012-03-19 20:29:03
Perfect @Creation 6floor
Looking at the periodic table, is the mass number twice the number of protons?
2012-03-19 20:30:17
This account has been disbanded 7floor
Is it helium?
2012-03-19 20:37:09
Perfect @Creation 8floor
I guess so…
2012-03-19 20:38:04
Perfect @Creation 9floor
He, 12C, 14N, 16O, 24Mg, 28Si hydrogen
2012-03-19 20:41:30
Perfect @Creation 10floor
The numbers in front are relative atomic masses
2012-03-19 20:43:11
Perfect @Creation 11floor
What grade level is this question?
2012-03-19 20:44:44
This account has been disbanded 12floor
First year of high school, a comprehensive question, currently seriously suspecting it is helium
2012-03-19 20:46:38
Hakurei Reimu 13floor
Horizontal is period, vertical is group, all are metals and non-metals.
2012-03-19 20:47:58
Perfect @Creation 14floor
A pretty annoying question...
2012-03-19 20:48:22
This account has been disbanded 15floor
Creating a rare element, I don't dare to write it
2012-03-19 20:49:13
Shirakami 16floor
Indicates being most afraid of chemistry...
2012-03-19 20:50:23
Perfect @Creation 17floor
You should study the periodic table carefully.
2012-03-19 20:51:38
This account has been disbanded 18floor
Here comes another question where the number of protons equals the number of neutrons, damn
2012-03-19 20:52:59
Perfect @Creation 19floor
Looking at the periodic table, if the mass number is twice the number of protons, then the number of protons and neutrons is equal.
2012-03-19 20:57:07
Hakurei Reimu 20floor
Have you started memorizing the periodic table? Later on, you'll have to memorize the main groups.
2012-03-19 20:57:55
Perfect @Creation 21floor
It started, and I don't recognize the characters used later, so frustrating!
2012-03-19 20:59:59
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