Isotopes
Write the atomic symbols for nitrogen-14 and nitrogen-15
14H7 15H7
Use the table below to find the average atomic mass of oxygen, O. Isotope % Abund. Atomic Mass O-16 99.75% 15.994916 O-17 00.04% 16.999132 O-18 00.21% 17.999153
15.999 u
Use the table below to find the average atomic mass of mercury, Hg. Isotope % Abund. Atomic Mass Hg-196 0.146% 195.965813 Hg-198 10.01% 197.966760 Hg-199 16.84% 198.968268 Hg-200 23.13% 199.968316 Hg-201 13.22% 200.970293 Hg-202 29.81% 201.970632 Hg-204 6.844% 203.973481
200.592 u
12C6 is an isotope of Carbon: what is the atomic number and the atomic mass number?
Atomic number: 6 Atomic mass: 12
What do isotopes of an element have in common? How do they differ?
The have the same atomic number (protons) but different number of neutrons causing the isotopes to having different atomic masses.
The mass of all fluorine atoms is 18.998 u. Do you think most fluorine atoms have 9 neutrons or 10 neutrons? Explain.
Most have 10 neutrons because the atomic number of fluorine is about 19 u.
Two atoms are found to contain the same number of neutrons. Can we use this information to determine that they are the same element? Explain.
No because different elements can have the same amount of neutrons.
