Review
TEST: ATOMS
1. Which element does this atomic
model represent? How can you tell?
1. Iron—atomic number of 26
2. What is the charge of this atom’s
nucleus?
2. + 38
3. What 2 particles of this atom work together to form
a neutrally charged atom?
3. Protons (+) and electrons (-)
4. Describe the particles that exist in
this atom’s outer region.
4. Negative electrons, mass=.001
5. What is the charge of this atom’s
cloud?—be specific!
5. +18
6. How many valence electrons does
this model have?
6. 3
7. What is the overall charge of this atom’s
center-most region?—its atomic number is 42!
7. +42
8. Tell me all you can about the particles that exist in
the nucleus of this atom with the protons.
8. Neutral neutrons, mass=1 AMU,
there are 4 in lithium
9. Identify this element
9. carbon
10. What is wrong with this model?
10. Place both electrons in 1st level
11. How many valence electrons will a
single atom of this element have?
11. 3
12. Will this element be stable/inert
or reactive? How can you tell?
12. Reactive…valence level not full!
13. What particle in this atom gives it
its identity?
13. proton
14. What is the overall charge of this
atom? Why?
14. Neutral…3-3=0
15. Is this atom stable/inert? How can
you tell?
15. No valence shell is not full
16. What element do I represent?
16. carbon
17. What element am I?
Mass (amu)
Atomic number
Density (g/mL)
# of valence
electrons
182
73
25
4
17. Tantalum
• Look back at the table!
18. Without the electrons, what is the
exact charge of this atom?
18. -3…note the 3 electrons
19. If we add 50 million neutrons to this atom,
what will the overall charge be?
19. Still neutral
20. If we take away an electron from this atom,
what will its overall charge be?
20. +1…now you have 1 more proton
than you have electrons.
21. Without the electrons, what is the
exact charge of this atom?
21. +3
22. What will determine this
substances reactivity?
22. The number of valence electrons
23. If we add 2 protons to this model,
how will it be affected?
23. It will become boron
24. What is my identity?
24. lithium
25. If an atom has 3 electron energy levels that are all
full, what would be the identity of the atom?
25. argon
26. If an atom has 4 protons, 5 neutrons, and 4
electrons, what would its atomic mass number be?
26. beryllium
27. Why is the electron cloud less massive than the
nucleus even though it is larger—takes up more space?
27. The electrons are so much
lighter!= .001 AMU