Chem Ch 4 Review Sheet--Atomic Structure

Proton
electron
nucleus
neutron
atom
mass number
atomic mass
atomic mass unit
isotope
atomic number

1.	Using the periodic table, determine the number of neutrons in O.
2.	Who was the man who lived from 460B.C.–370B.C. and was among the first to suggest the idea of atoms?
3.	Dalton's atomic theory included which idea?
4.	The range in size of most atomic radii is approximately ____.
5.	Who conducted experiments to determine the quantity of charge carried by an electron?
6.	What is the relative mass of an electron?
7.	The particles that are found in the nucleus of an atom are ____.
8.	As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?
9.	The mass number of an element is equal to ____.
10.	How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
11.	How is the number of neutrons in the nucleus of an atom calculated?
12.	Why do chemists use relative masses of atoms compared to a reference isotope rather than the actual masses of the atoms?
13.	The atomic mass of an element is the ____.
14.	The atomic mass of an element depends upon the ____.
15.	The smallest particle of an element that retains the properties of that element is a(n) ____.
16.	Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that ____.
17.	The atomic number of an element is the total number of which particles in the nucleus?
18.	An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
19.	The sum of the protons and neutrons in an atom equals the ____.
20.	What does the number 84 in the name krypton-84 represent?
21.	All atoms of the same element have the same ____.
22.	Isotopes of the same element have different ____.
23.	Isotopes of the same element have different ____.
24.	What unit is used to measure weighted average atomic mass?
25.	List the number of protons, neutrons, and electrons in C.
26.	Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37. The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
27.	Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?
28.	A fictitious element X is composed of 10.0 percent of the isotope , 20.0 percent of the isotope , and 70.0 percent of the isotope .  Estimate the atomic mass of element X.
29.	About how many more times massive is a proton than an electron?
30.	What is the atomic number for an element with 41 neutrons and a mass number of 80?
31.	How many electrons are in an atom of gold?
32.	What is the mass number for an oxygen atom that has 10 neutrons in its nucleus?
33.	How many protons are present in the nuclei of the three known isotopes of hydrogen?
34.	Use the periodic table to determine the number of neutrons in nitrogen-14.
35.	How many neutrons are present in an atom of the isotope U?

36.	Calculate the number of neutrons in Pb.
37.	What is the relative charge carried by an electron?
38.	What is the relative charge of a proton?
39.	Use the periodic table to determine the number of electrons in a neutral atom of lithium.
40.	Use the periodic table to determine the number of protons in an atom of barium.
41.	How many protons are present in an atom of Be-9?
42.	What is the total number of subatomic particles in the nucleus of an atom of Bi?
43.	Determine the number of electrons in an atom of iridium.
44.	Explain how the atoms of one element differ from those of another element.