Atomic Structure Worksheet

The 3 particles of the atom are:

The number of protons in one atom of an element determines the atom’s __________, and the number of electrons determines __________ of an element.

The atomic number tells you the number of __________ in one atom of an element. It also tells you the number of __________ in a neutral atom of that element. The atomic number gives the 'identity' of an element as well as its location on the Periodic Table. No two different elements will have the __________ atomic number.

The __________ of an element is the average mass of an element’s naturally occurring atom, or isotopes, taking into account the __________ of each isotope.

The __________ of an element is the total number of protons and neutrons in the __________ of the atom.

The mass number is used to calculate the number of __________ in one atom of an element. In order to calculate the number of neutrons you must subtract the __________ from the __________.

Give the symbol and number of protons in one atom of: Lithium __________ Bromine __________ Iron __________ Copper __________ Oxygen __________ Mercury __________ Krypton __________ Helium __________

Give the symbol and number of electrons in a neutral atom of: Uranium __________ Chlorine __________ Boron __________ Iodine __________ Antimony __________ Xenin __________

Give the symbol and number of neutrons in one atom of: (To get 'mass number', you must round the 'atomic mass' to the nearest whole number) Show your calculations. Barium __________ Bismuth __________ Carbon __________ Hydrogen __________ Fluorine __________ Magnesium __________ Europium __________ Mercury __________

Name the element which has the following numbers of particles: a. 26 electrons, 29 neutrons, 26 protons __________ b. 53 protons, 74 neutrons __________ c. 2 electrons (neutral atoms) __________ d. 20 protons __________ e. 86 electrons, 125 neutrons, 82 protons (charged atom) __________ f. 0 neutrons __________