Name: ______Score ______/ 37
Self Assessment: Models of Atoms
1. – 9. Fill in the following chart about the particles that make up atoms.
Particle / Location / Charge / MassProton
Neutron
Electron
10. – 11. What is a valence electron and why are they significant (what does it do)?
12. Sometimes atoms gain or lose electrons. Then they are called ______.
Chlorine forms a negative 1. This is written ______.
13. Sometimes atoms just naturally have more or less neutrons. These are called
______. Hydrogen sometimes forms with 2 neutrons. This is written ______.
14. – 15. Rows on the periodic table are also called ______. The
number of the row tells you the number of ______the atom has. As you go across a row, what patterns occur to the atoms?
16. – 17. Columns on the periodic table are called ______. The number
on the column tells you the number of ______the atom has. As you go down a column, what patterns occur to the atom?
18. – 21. We mentioned 5 models of the atom/scientists other than the
current model (Quantum). Name and describe two. Also compare/contrast them to the Quantum model.
22. – 27. Fill in the following chart:
Element: / # protons / # neutrons / # electronsBeryllium
Phosphorus
28. – 31. Draw a Bohr model for those elements.
Beryllium Phosphorus
32. – 33. Draw a Lewis Diagram for those elements.
Beryllium Phosphorus
Use the patterns that are in the periodic table to answer the following.
34. How many valence electrons does Tellurium have?
35. How many valence electrons does Strontium have?
36. What is the Lewis diagram for Cesium?
37. What is the Lewis diagram for Radon?
Name: _Answer Key__ Score _37_/ 37
Self Assessment: Models of Atoms
1. – 9. Fill in the following chart about the particles that make up atoms.
Particle / Location / Charge / MassProton / nucleus / positive / 1 amu
Neutron / nucleus / neutral / 1 amu
Electron / Orbital/energy level (electron cloud) / negative / negligible
10. – 11. What is a valence electron and why are they significant (what does it do)?
Outer most electrons … determine
properties/ability to combine chemically or bond
12. Sometimes atoms gain or lose electrons. Then they are called _ions_. Chlorine
forms a negative 1. This is written _Cl-_.
13. Sometimes atoms just naturally have more or less neutrons. These are called
__isotopes_. Hydrogen sometimes forms with 2 neutrons. This is written ______3H______.
14. – 15. Rows on the periodic table are also called __periods_. The
number of the row tells you the number of _energy__ _levels__ the atom has. As you go across a row, what patterns occur to the atoms?
Atomic number goes up by 1
Number of protons goes up by 1
Number of electrons goes up by 1 (in a
neutral atom)
Number of valence electrons goes up by 1
Energy level stays the same
16. – 17. Columns on the periodic table are called _group or family_. The
number on the column tells you the number of _valence_ __electrons*__ the atom has. As you go down a column, what patterns occur to the atom?
Number of valence electrons stays the
same*
Energy level goes up by 1
* Skip family 3-12, they do weird things. We’ll come
back to them later
18. – 21. We mentioned 5 models of the atom/scientists other than the
current model (Quantum). Name and describe two. Also compare/contrast them to the Quantum model.
Democritus…solid spheres, homogeneous
(sim= not a whole lot, diff = not solid)
John Dalton…solid spheres, elements,
Symbols (sim= use symbols, diff = not
solid)
JJ Thomson…electron…plum pudding
(chocolate chip cookie)(sim = electrons,
diff = not solid)
Earnest Rutherford…gold foil, positive
nucleus, atom mostly empty space (sim=
nucleus, empty space, electrons, diff= not know exactly where electrons are)
Niels Bohr…planetary model, energy levels,
paths for electrons (sim = electrons diff amts. Energy, diff = not orbits, move too fast (orbitals)
22. – 27. Fill in the following chart:
Element: / # protons / # neutrons / # electronsBeryllium / 4 / 5 / 4
Phosphorus / 15 / 16 / 15
28. – 31. Draw a Bohr model for those elements.
Beryllium Phosphorus
32. – 33. Draw a Lewis Diagram for those elements.
Beryllium Phosphorus
Be P
Use the patterns that are in the periodic table to answer the following.
34. How many valence electrons does Tellurium have?
Te has 6…it’s in column 16, they all have 6
35. How many valence electrons does Strontium have?
Sr has 2…it’s in column 2, they all have 2
36. What is the Lewis diagram for Cesium?
Cs
37. What is the Lewis diagram for Radon?
Rn