2. Atoms & Elements

The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?

According to the table above, how many electrons are required to produce a charge of –2.0 C?

If the charge and mass of one proton is 1.60218 x 10^-19 C and 1.673 x 10^-24 g respectively, what is the charge of 378 kg of protons?

Rounded to the nearest whole number, how many protons are in an atom of krypton?

Oxygen has an atomic number of 8. What can you conclude from this fact?

On the periodic table, gold has the atomic number 79. This means that

How many neutrons are in an atom of copper? Round your answer to the nearest whole number.

An atom of the isotope ¹³³Cs contains how many protons (p), neutrons (n), and electrons (e)?