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Vincent Van Gogh

Unit 2 Exam The Neutral Atom

Congratulations! Weve made it to the end of Unit 2. This is your chance to prove all you
have learned. Do your very best on this test. Lets make our BOLD 80% class goal. I
believe in you. Believe in yourself and give it your all. Do the questions you know best first,
then go back to any you are unsure about.

_____/10 Atomic Structure

Use words from the word bank to label the parts of the following diagram - Not all
words will be used. (2 points per blank):

1. 4.

Word bank
Energy Levels/

_____/10 Subatomic Particles

Fill in the blanks in the following chart with the correct word on your answer sheet.
(2 pts each)


1 amu 6. answer on
Proton p+ Positive
answer sheet
7. answer
Inside the
Neutron n on answer Neutral
8. answer
10. answer
on 9. answer on
Electron 0 amu on answer
answer answer sheet
____/10 Element Block Calculations

11. (2 pts) Which element has 16 protons in its nucleus?

(A) Carbon
(B) Sulfur
(C) Oxygen
(D) Krypton

12. (2 pts) Why is cobalt (Co) before nickel (Ni) on the periodic table, even though it has a
higher average atomic mass than nickel?
(A) Nickel has one more proton than cobalt.
(B) Cobalt was discovered first.
(C) Nickel has fewer electrons than cobalt.
(D) Cobalt has a lower density than nickel.

For questions 13-15, calculate the number of protons, neutrons, and electrons in an
atom of each element using information on the periodic table. Make sure to
write your answer on your answer sheet.

Element Protons Electrons Neutrons

13. Chlorine
14. Oxygen
15. Hydrogen

____/10 Neutral Atom

16. (2 pts) The charge on a neutral atom is ____________.

(A) zero since the atom contains an equal number of electrons and protons.
(B) positive since protons have a greater mass.
(C) negative since electrons are so far from the nucleus.
(D) determined only by the number of protons.

17. (2 pts) The atomic number of bromine is 35. A neutral bromine atom will have _______
(A) 35 protons
(B) 80 protons
(C) 7 protons
(D) 17 protons

(A) 35 electrons
(B) 7 electrons
(C) 80 electrons
(D) 17 electrons
19. (4 pts) A magnesium atom has 12 protons and 10 electrons. Short Answer: Is it
neutral? If yes, why? If no, what does it need to become neutral?

_____/10 Groups and Periods

20. (2 pts) Which group/family is fluorine in (look at your periodic table)?

(a) Transition Metals (Groups 3a-2b)
(b)Alkali Metals (Group 2)
(c) Halogens (Group 7)
(d)Noble Gases (Group 8)

21. (2 pts) What group number and period number is Calcium (Ca) in?
(a) Group 40, Period 1
(b)Group 4, Period 20
(c) Group 2, Period 4
(d)Group 4, Period 2
22. (2 pts) Which of the following pairs of elements contains two elements in the same
(a) Aluminum(Al) and Gallium (Ga)
(b)Aluminum (Al) and Argon (Ar)
(c) Iron (Fe) and Cobalt (Co)
(d)Lithium (Li) and Boron (B)

(a) Sodium (Na) and Potassium (K)
(b)Sodium (Na) and Magnesium (Mg)
(c) Carbon (C) and Silicon (Si)
(d)Chlorine (Cl) and Neon (Ne)

24. (2 pts) Which two elements are in the same group as Sulfur (S)?
(a) Boron (B) and Carbon (C)
(b)Aluminum (Al) and Chlorine (Cl)
(c) Lithium (Li) and Sodium (Na)
(d)Selenium (Se) and Oxygen (O)

____/10 Isotopes

25. (2 pts) Isotopes are two atoms of the same element with the same number of
_____________, but different number of _____________.
(A) protons, electrons.
(B) protons, neutrons.
(C) neutrons, protons.
(D) electrons, neutrons
Use the following information to answer the following three questions
Here are three isotopes of Fluorine: 9
F 9 F
26. (2 pts) The number 9 refers to the:
(A) Atomic number
(B) Number of neutrons
(C) Mass number
(D) Number of electrons

27. (2 pts) The numbers 18, 19, and 20 refer to the:

(A) Number of neutrons
(B) Mass number
(C) Number of electrons
(D) Number of protons and electrons

28. (2 pts) The average atomic mass of neon is 20.179 amu. How many neutrons do
most neon atoms have in their nucleus?
(A) 8
(B) 10
(C) 11
(D) 20

29. (2 pts) What makes up most of the mass of a calcium atom?

(A) only protons
(B) only neutrons
(C) protons and electrons
(D) protons and neutrons
____/10 Metals and Nonmetals

30. (2 pts) The table below provides some properties of the imaginary elements A, D, E, and
G. Which element is most likely a nonmetal?
Heat and
(A) Element A Elemen Magnetis
(B) Element D t m
(C) Element E A High Low
(D) Element G D High High
E Low Low
G Low High

31. (2 pts) Pure silicon (Si) is chemically

classified as a metalloid because silicon:
(A) is malleable and can be made into wires.
(B) is shiny and hard
(C) is a very good conductor of electricity and heat.
(D) shows both metallic and nonmetallic properties.

32. (2 pts) Metals are located on the ________ side of the periodic table and nonmetals are
located at the ________ of the periodic table.
(A) Top, bottom
(B) Right, left
(C) Bottom, top
(D) Left, right

33. (2 pts) Which of the elements below is a nonmetal?

(A) Potassium
(B) Copper
(C) Calcium
(D) Argon

34. (2 pts) Which of the elements below is a metal?

(A) Lithium
(B) Helium
(C) Xenon
(D) Chlorine