Name:_____________________
Period:____________
Answer the following questions with research from the internet and information found in chapter 4.1 and 4.3
1.
Describe Democritus contribution to the development of the atomic theory.
2.
What does the Greek word atomos mean?
3.
Who was John Dalton and what did he say about all atoms?
4.
What did Dalton have to back up his theory that Democritus did not have?
5.
Who what J.J. Thomson?
6.
What did Thompson discover?
7.
Describe the plum pudding model.
8.
Who was Ernest Rutherford?
9.
What did he discover?
10.
What experiment did he use to make his discovery?
11.
Who was Niels Bohr?
12.
Where did Bohr say electrons could be found?
13.
What are electron orbitals?
14.
What are photons and what do they have to do with electrons?

Answer the following questions with information found in chapter 4.2 pg 119-125.
Fill in the chart below from page 119 in your book:
Particle Charge Mass (kg) Location in the atom
The 3 particles of the atom are: a.______________________ b.______________________ c.______________________
Their respective charges are: a.______________________ b.______________________ c.______________________
1.
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.
2.
The atomic number gives the “identity “of an element as well as its location on the Periodic Table. No two elements will have the _________atomic number and the atomic number of a given element never
________.
3.
The __________ ____________of an element is the total number of protons and neutrons in the______________ of the atom.
4.
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 _____________.
5.
An _____________ is an atom that has the same number of protons but a different number of neutrons relative to other atoms of the same element.
6.
The ___________ ___________ ___________of an element is the average mass of an element’s naturally occurring atom, or isotopes, taking into account the ____________ of each isotope.
7 .Give the symbol and number of protons in one atom of:
Lithium __________________ Bromine ________________
Iron _____________________ Copper __________________
Oxygen __________________ Mercury ________________
Krypton __________________ Helium __________________
8.Give the symbol and number of electrons in a neutral atom of:
Uranium __________________ Chlorine __________________
Boron __________________ Iodine __________________
Antimony __________________Xenon __________________
9.Give the symbol and number of neutrons in one atom of:

(To get the “mass number”,you must round the “atomic mass ” to the nearest whole number)) Show your calculations.
Barium __________________Bismuth __________________
Carbon __________________Hydrogen __________________
Fluorine __________________Magnesium __________________
Europium __________________Mercury __________________
10.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 _____________________
11 .
If you know only the following information can you always determine what the element is? (Yes/No). a. number of protons ___________ b.number of neutrons___________ c.number of electrons in a neutral atom___________ d.number of electrons___________