1. A silver sample contain 52 atoms , each having 60 neutrons , and 48
atoms , each having 62 neutrons , what is the sample's average atomic mass ?
2. Why are protons and neutrons also known as nucleons ?
3. Lead and mercury are two pollutants in the environment . From
information about them in the periodic table , why are they called heavy metals ?
** 回答時的文法不要錯 ...
** 字數不限 , 但不要太多 , 也不要太少 ...
3 條 物理的問題 ( 英文 ) 急急急 !!!
2008-03-06 12:20 am
回答 (1)
2008-03-06 9:48 am
✔ 最佳答案
ALL of them are Chemistry, NOT PHYSICS!!Q1.
average atomic mass
= [52 x (47 + 60) + 48 x (47 + 62)] / (52 + 48)
= (52 x 107 + 48 x 109) / 100
= 107.96
Q2.
Because both of them are located at the nucleus!!
"neclueons" refer to particles exist in nucleus.
Q3.
Due to their high relative atomic mass (large atomic size) and their strong metallic properties.
收錄日期: 2021-04-13 15:14:49
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