All atoms of the same element have the same _____________.
All atoms are neutral
with the number of protons equaling the _______.
Using the periodic table
determine the number of neutrons in 16O.
How many protons
electrons
Who was the man who lived from 460 B.C. – 370 B.C.
and was among the first to suggest the idea of atoms?
A fictitious element “X” has 10.0 % of the isotope with mass 55 amu
20.0 % of the isotope with mass 56 amu
Element “Z” has two isotopes: one has mass number of 19.0 amu is 55.0 % abundant
and the isotope with mass number 21.0 amu is 45.0 % abundant. What is the average atomic mass for element Z?
Iodine-131 has a half life of 8 days. a) What fraction of the original sample would remain at the end of 40 days? b) If you started with 300 grams
how much do you have left after 32 days?