4.3 quiz study guide

Question 1

what distinguishes the atoms of one element from the atoms of another?

Answer 1

the number of protons distinguishes the atoms of one element from those of another

Question 2

how do the isotopes of a given element differ from one another?

Answer 2

they differ bc of a different amount of neutrons

Question 3

how is atomic mass calculated?

Answer 3

multiply the mass of each isotope by its natural abundance, expressed as a decimal, and then add the products.

Question 4

what equation tells you how to calculate the number of neutrons in an atom?

Answer 4

mass # - atomic # (top - bottom)

N=A-Z

N=Number of Neutrons
A=Mass Number
Z=Atomic Number

Question 5

how is the atomic number different from mass number?

Answer 5

○ atomic number is the number of protons in an atom

○ mass number is the number of protons + neutrons in an atom

Question 6

what does the number represent in the isotope platinum-194?

Answer 6

mass number

Question 7

the atomic masses of elements are generally not whole numbers.
explain why.

Answer 7

○ the elements have different isotopes. ○ the atomic mass is the AVERAGE of all the isotopes of the element that exist
○ each isotope has a diff # of neutrons, so the mass is diff

Question 8

to find out # of protons, neutrons, and electrons:

Answer 8

protons = atomic # (bottom)
neutrons = mass - atomic (top - bottom)
electrons = to protons