2. Atoms & Elements

Which atom has a nucleus that contains 13 protons and 14 neutrons?

Which radioactive isotopes were discovered by Marie and Pierre Curie?

In the isotope polonium-218, what does the number 218 represent?

How many neutrons are present in the most abundant isotope of lead?

How many neutrons are present in an atom of lead-207 (Pb-207)?

Which isotope of argon (Ar) has 22 neutrons?

What is the name of the silicon isotope that has 15 neutrons?

How many neutrons are present in an atom of the isotope Hg-201?

Fluorine-18 undergoes beta-plus (positron) decay. What is the atomic mass of the resulting child isotope?

In order to determine if two atoms are copper (Cu) atoms, which property must they have in common?

How many neutrons are present in an atom of lithium-7?

How many neutrons are present in an atom of tin-120 (Sn-120)?

Scandium has an atomic number of 21 and its most abundant isotope is Sc-45. How many neutrons are present in this isotope of scandium?

If the natural abundance of Br-79 is 50.69%, which of the following statements is correct regarding the isotopic composition of naturally occurring bromine?