[ريم علي الشهري]

Chapter 2 Atoms Molecules and Ions
__________________________________________________ _________________________
NOTE: A periodic table is required to work many of the problems in this chapter.

1.​Which of these elements is most likely to be a good conductor of electricity?

A.​N
B.​S
C.​He
D.​Cl
E.​Fe

2.​The scientist who determined the magnitude of the electric charge of the electron was

A.​John Dalton.
B.​Robert Millikan.
C.​J. J. Thomson.
D.​Henry Moseley.
E.​R. Chang.

3.​Rutherford's experiment with alpha particle scattering by gold foil established that

A.​protons are not evenly distributed throughout an atom.
B.​electrons have a negative charge.
C.​electrons have a positive charge.
D.​atoms are made of protons, neutrons, and electrons.
E.​protons are 1840 times heavier than electrons.


4.​An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons?
(p = proton, n = neutron, e = electron)

A.​15 p, 16 n, 15 e
B.​16 p, 15 n, 16 e
C.​16 p, 31 n, 16 e
D.​32 p, 31 n, 32 e
E.​16 p, 16 n, 15 e


5.​A magnesium ion, Mg2+, has

A.​12 protons and 13 electrons.
B.​24 protons and 26 electrons.
C.​12 protons and 10 electrons.
D.​24 protons and 22 electrons.
E.​12 protons and 14 electrons.


6.​Which of these pairs of elements would be most likely to form an ionic compound?

A.​P and Br
B.​Cu and K
C.​C and O
D.​O and Zn
E.​Al and Rb

7.​What is the formula for the ionic compound formed by calcium ions and nitrate ions?

A.​Ca3N2
B.​Ca(NO3)2
C.​Ca2NO3
D.​Ca2NO2
E.​CaNO3


8.​Which is the correct formula for copper(II) phosphate?

A.​Cu2PO4
B.​Cu3(PO4)2
C.​Cu2PO3
D.​Cu(PO4)2
E.​Cu(PO3)2


9.​The correct name for NH4NO3 is

A.​ammonium nitrate.
B.​ammonium nitrogen trioxide.
C.​ammonia nitrogen oxide.
D.​hydrogen nitrogen oxide.
E.​hydrogen nitrate.



10.​Which of these elements is chemically similar to oxygen?

A.​sulfur
B.​calcium
C.​iron
D.​nickel
E.​sodium


Chapter 2 Atoms Molecules and Ions Key

1.E

2.B

3.A

4.B

5.C

6.D

7.B

8.B

9.A

10.A