how to find the mass number of the first 18 elements
genivedaan06:
Have you memorized atomic numbers of the elements?
if yes then there is a trick
for evdn atomic mumbers, mass number is twice the atomic no
even,
and for odd nos its (n×2)+1
there are a few exceptions which i reccommend memorizing
Answers
Answered by
1
If you remember the number of protons and nuetrons then you can add them.
btw
this works only for first 18 elementa
whats ur name
read my
bio
also
there are some excpetions
hhm ok thanks alot
nitrogen chlorine and argon
nitrogen-14, chlorine-35.5,argon-40
Answered by
3
How to find the mass number of the first 18 elements
Together, the number of protons and the number of neutrons determine an element's mass number:
mass number = protons + neutrons.
- If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
Khadijah21
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