nuclear chem

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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?