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Standard 2: Atoms, Isotopes, & Absolute Age

Total questions: 36

Worksheet time: 1hrs 14mins

Name
Class
Date
1.

H, He, Li, Be, etc. are different ________________.

a)

elements

b)

protons

c)

neutrons

d)

electrons

2.

The proton _____

a)

has no mass and is neutral

b)

has an atomic mass of 1 and is negatively charged

c)

has an atomic mass of 1 and is positively charged

d)

has no mass and is negatively charged

3.

The neutron has:

a)

an atomic mass of 1 and neutral charge

b)

an atomic mass of 0 and negative charge

c)

an atomic mass of 1 and positive charge

d)

an atomic mass of 0 and neutral charge

4.

The electron has _____

a)

an atomic mass of 1 and positive charge

b)

low mass and positive charge

c)

low mass and neutral (no charge)

d)

low mass and negative charge

5.

Each of the elements (such as H, He, Li, Be, etc.) is a different substance than the other elements because they all have different numbers of __________________.

a)

elements

b)

protons

c)

neutrons

d)

electrons

6.

Which particles hang out in the nucleus of an atom?

a)

wontons

b)

bosons

c)

neutrons

d)

electrons

e)

protons

7.

Which subatomic particles determine the identity of an element?

a)

electrons

b)

protons

c)

neutrons

d)

photons

8.

Neutrons...

a)

serve as a source of charge in an atom

b)

serve as a shock absorber for collisions

c)

serve as a shield for radiation

d)

help to hold the nucleus together

9.

Atoms of the same element have the same number of _____

a)

electrons in their nuclei

b)

orbiting protons

c)

neutrons in their nuclei

d)

protons in their nuclei

10.

Variants of an element, with different masses, different numbers of neutrons, but the same chemical properties, are called _____

a)

isotropics

b)

isotherms

c)

isomers

d)

isotopes

11.

What do these three images represent?

a)

different isotopes of the same element

b)

different elements

c)

they are all radioactive elements

d)

electrons within an atom

12.
Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.
a)
true
b)
false
13.

What is the neutron's role in the nucleus?

a)

To help hold the atom together.

b)

To attract the electrons to the protons.

c)

To increase the mass of the atom, allowing it to react properly with other elements.

d)

To determine the type of element the atom is.

14.
Isotopes are atoms that have the same number of ________ but differing number of __________
a)
protons, electrons
b)
neutrons, protons
c)
protons, neutrons
d)
electrons, protons
15.
What do these isotopes of carbon all have in common?
a)
mass number
b)
#neutrons
c)
atomic number and # protons
d)
half lives
16.
What quantities vary between isotopes of an element? (What is different from isotope to isotope?)
a)
protons, electrons, and atomic mass
b)
protons, electrons, and atomic number
c)
neutrons and electrons
d)
neutrons and atomic mass
17.
What do these isotopes of carbon all have in common?
a)
mass number
b)
# neutrons
c)
# protons
d)
same half-lives
18.
Why are these all considered to be isotopes of Lithium?
a)
same # neutrons
b)
same # protons, but different # neutrons
c)
same atomic mass
d)
same half-lives
19.
which isotope of Lithium has  3 protons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of protons
20.
which isotope has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
21.

Two isotopes of Oxygen are oxygen-16 and oxygen-18. These isotopes differ from one another by two neutrons.

a)

true

b)

false

22.

Isotopes that will decay are called __________ isotopes.

a)

weak

b)

unsteady

c)

unstable

d)

variable

23.

Radioactivity is the release of __________ from unstable atoms

a)

strength

b)

protons

c)

electrons

d)

energy (and / or particles)

24.

A process in which atoms of an unstable element decay into atoms of a stable element

a)

radiometrics

b)

half-life

c)

decay rate

d)

radioactive decay

25.

When an unstable radioactive atom decays, it eventually turns into:

a)

a more stable atom

b)

a less stable atom

c)

the exact same atom but with less pure energy

d)

empty space

26.

The time necessary for half of the parent isotope to decay into daughter isotopes.

a)

half-time

b)

parental-decay

c)

half-life

d)

half-decay

27.

the element that undergoes radioactive decay is called the _____________ isotope.

a)

daughter

b)

parent

c)

foster

d)

sibling

28.

Radioactive Decay converts

a)

Half lives into daughter isotopes.

b)

Parent Isotopes into Daughter Isotopes.

c)

Daughter Isotopes into Parent Isotopes.

d)

Parent Isotopes into Half lives.

29.
How is radioactive dating used to determine the absolute age of rocks?
a)
The percent of radioactive parent isotopes remaining in the rock is compared to the amount of stable daughter isotopes that are present
b)
it compares the radioactive isotope in a younger layer of rock to an older layer
c)
isotopes of different compounds are compared
d)
daughter isotopes are compared to sister isotopes
30.

Americium-241 is radioactive. Neptunium -237 is not radioactive. Which isotope is the PARENT isotope?

a)

Neptunium

b)

Americium

31.

Americium-241 is radioactive. Neptunium -237 is not radioactive. Which isotope is the DAUGHTER isotope?

a)

Neptunium

b)

Americium

32.

Americium-241 is radioactive. Neptunium -237 is not radioactive. Which bar graph represents the YOUNGEST sample (a rock sample that was most recently formed from magma)?

a)

A

b)

B

c)

C

d)

D

e)

E

33.

Americium-241 is radioactive. Neptunium -237 is not radioactive. Which bar graph represents the OLDEST sample (a rock sample that formed from magma long ago)?

a)

A

b)

B

c)

C

d)

D

e)

E

34.

Americium-241 is radioactive. Neptunium -237 is not radioactive. Which bar graph represents a rock sample for which one half life has passed?

a)

A

b)

B

c)

C

d)

D

e)

E

35.

Americium-241 is radioactive. Neptunium -237 is not radioactive. Which bar graph represents a rock sample for which TWO half lifes have passed?

a)

A

b)

B

c)

C

d)

D

e)

E

36.

If a radioactive substance has a half life of 200 years, how much time has passed if ¼ (25%) of the original isotope is left? (Hint: Figure out how many half lifes have passed to get to 25%, then multiply that by the time for each half life - 200 years.)

a)

25 years

b)

600 years

c)

50 years

d)

400 years

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