11th. Chemistry - Isotope Quiz

Question 0

Boron exists in two isotopes, boron-10 and boron-11. Based on the atomic mass, which isotope should be more abundant?

Answer 0

Boron because the mass number is closer to the atomic mass listed on the periodic table

Question 1

Naturally occurring Europium (Eu) consists of two isotopes with a mass of 151 and 153. Europium 151 has an abundance of 48.03% and Europium -153 has an abundance of 51.97%. What is the atomic mass of Europium?

Answer 1

151 * .4803 + 153 * .5197 = 152.04

Question 2

Titanium has five common isotopes. Ti46 (8.0%), Ti47(7.8%), Ti48 (73.4%), Ti49(5.5%), and Ti50(5.3%). What is the average atomic mass of titanium?

Answer 2

2.65

Question 3

T/F

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

Answer 3

False. Same atomic number.

Atomic mass differs based on # of neutrons.

Question 4

What is the difference between carbon 12 and carbon 13 if all carbon atoms have an atomic number of 6?

Answer 4

C12 has 6 neutrons

C13 has 7 neutrons

Question 5

T/F

If an element were to add an extra proton it would become an entirely new element.

Answer 5

True.

As atomic number changes, the element moves on the periodic table of elements.

Question 6

What does the number next to the isotope signify?
A. Atomic number
B. Atomic mass
C. Place on the periodic chart
D. Number of electrons

Answer 6

B. Atomic mass. Protons + neutrons

Question 7

If boron-10 and boron-11 both have an atomic number of 5 how many electrons, neutrons, and protons does the isotope have?

Answer 7

5 protons - atomic #
5 electrons also
Boron-11 has 6 neutrons
Boron-10 has 5 neutrons

Question 8

T/F

If an extra neutron were added to an element, it would become an entirely new element.

Answer 8

False.

Adding a neutron increases only the atomic weight and makes it an isotope of the element. ( i.e. C12 becomes C13)

Question 9

If carbon has six protons how many electrons does it have?

Answer 9

Six also.

Question 10

Atomic mass consists of 
A. Protons and electrons
B. Protons and neutrons
C. Electrons and neutrons
D. Protons, electrons and neutrons

Answer 10

B. Protons and neutrons

Electrons are practically without mass

Question 11

How can you tell isotopes of the same element apart?
A. Compare atomic number
B. Compare atomic mass
C. Look them up on the periodic chart
D. Count the number of electrons

Answer 11

B. Compare atomic mass

Question 12

How many electrons, neutrons, and protons does Chromium-58 have if the element has an atomic number of 24?

Answer 12

Protons - 24
Electrons - 24
Neutrons - 34

Question 13

How many electrons, neutrons, and protons does Nitrogen-20 have if the isotope has an atomic mass of 20?
A. 5 electrons, 10 neutrons and 5 protons
B. 4 electrons, 8 neutrons and 8 protons
C. 7 electrons, 6 neutrons, and 7 protons
D. 7 electrons, 13 neutrons, and 7 protons

Answer 13

D. 7 electrons, 13 neutrons, and 7 protons

Remember — Only neutrons and protons = atomic mass
13. +. 7. =. 20

Question 14

Which of the following are true of isotopes?
A. Isotopes are different versions of the same element
B. Same number of protons for isotopes of the same elements
C. Different number of neutrons between isotopes of the same element
D. All of the above are true

Answer 14

D. All of the above are true