Practice Exam #1 1-13

Question 1

The nucleus of an atom carries a positive electrical charge that is balanced by the negative electrical charge of?

Answer 1

Orbital Electrons

Question 2

The number of ________ determines the atoms chemical properties is?

Answer 2

Electrons

Question 3

An elements atomic number “Z” is the number of?

Answer 3

Protons

Question 4

Atomic mass number “A” is the sum of the protons and neutrons in the nucleus? True or False

Answer 4

True

Question 5

How many neutrons does the element Copper have with an atomic mass number of 63 and the atomic number 29?

Answer 5

34 neutrons

Question 6

Isotopes of a given element have the same atomic number but have a different number of?

Answer 6

Neutrons

Question 7

One atomic mass unit is equal to 1/12 the mass of ______ nucleus.

Answer 7

Carbon 12

Question 8

What best describes mass defect?

Answer 8

the total mass of nuclide is less than the total mass of the individual particles

Question 9

Binding energy is the amount of energy that must be provided to a nucleus in order to break it apart into separate protons and neutrons? True or False

Answer 9

True

Question 10

Completes this statement. _____ is the amount of an isotope present in a normal natural mixture?

Answer 10

Isotope abundance

Question 11

Name a method that is not a method of radioactive decay?

Answer 11

Nuclear Fission

Question 12

Which best describes when atoms are radioactive?

Answer 12

When the atom emits radiation during its spontaneous transformation to the atom of another isotope or element.

Question 13

An unstable atom can decay by emitting an alpha particle? True or False

Answer 13

True