Back
to top
Chemistry - help
Watch this threadPage 1 of 1
Go to first unread
Skip to page:
TrishaChou1
Badges:
12
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
I'm so confused with the definition of Atomic number and Mass number, also when there's an isotope how does the mass number change?
0
reply
Yazomi
Badges:
21
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report
#2
(Original post by TrishaChou1)
I'm so confused with the definition of Atomic number and Mass number, also when there's an isotope how does the mass number change?
I'm so confused with the definition of Atomic number and Mass number, also when there's an isotope how does the mass number change?
Mass number/atomic mass = protons+neutron
Every single element has a unique number of protons ie an element that has 12 protons can only be carbon and nothing else.
Isotopes are when the proton number is the same and therefore same element, but they have different number of neutrons.
Therefore atomic mass vary depending on the difference in neutron number
Mass of proton =1.
Mass of neutron =1.
1
reply
TrishaChou1
Badges:
12
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
(Original post by Yazomi)
Atomic number is the number of protons
Mass number/atomic mass = protons+neutron
Every single element has a unique number of protons ie an element that has 12 protons can only be carbon and nothing else.
Isotopes are when the proton number is the same and therefore same element, but they have different number of neutrons.
Therefore atomic mass vary depending on the difference in neutron number
Mass of proton =1.
Mass of neutron =1.
Atomic number is the number of protons
Mass number/atomic mass = protons+neutron
Every single element has a unique number of protons ie an element that has 12 protons can only be carbon and nothing else.
Isotopes are when the proton number is the same and therefore same element, but they have different number of neutrons.
Therefore atomic mass vary depending on the difference in neutron number
Mass of proton =1.
Mass of neutron =1.
0
reply
EierVonSatan
Badges:
21
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report
#4
Relative atomic mass and mass number are different.
Mass number = number of protons and neutrons added together - so it's always a whole number!
Relative atomic mass = the weighted average of the mass numbers of all of the isotopes - will often be a decimal e.g. Cl has an Ar of 35.5 since it is made from 25% 37Cl and 75% 35Cl
Mass number = number of protons and neutrons added together - so it's always a whole number!
Relative atomic mass = the weighted average of the mass numbers of all of the isotopes - will often be a decimal e.g. Cl has an Ar of 35.5 since it is made from 25% 37Cl and 75% 35Cl
1
reply
arkadi342
Badges:
3
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report
#5
(Original post by TrishaChou1)
I'm so confused with the definition of Atomic number and Mass number, also when there's an isotope how does the mass number change?
I'm so confused with the definition of Atomic number and Mass number, also when there's an isotope how does the mass number change?
the mass number is the number of both protons and neutrons (so is the bigger number)
an isotope is an atom of an element that has a different number of neutrons, but the same number of protons and electrons, to most atoms of that elemet.
an isotope will have the same atomic number, but a different mass number.
1
reply
X
Page 1 of 1
Go to first unread
Skip to page:
Quick Reply
