Alchemy Quiz 10

Lithium has an atomic number of 3 and an average atomic mass of 6.941 amu. Which isotope would you find in the greatest abundance for lithium?

• lithium-7

• lithium-4

• lithium-6.95

• lithium-6.9

• lithium-6

Answer explanation

If you round the average atomic mass to the nearest whole number, you will get the mass number of the most common isotope.

In the isotope symbols shown below, what does the number on the left above the “C” represent?

• number of protons

• number of neutrons

• atomic number

• mass number

Answer explanation

Tags

NGSS.MS-PS1-1

What is different about the three different isotopes shown?

• number of nuclei

• number of protons

• number of neutrons

• number of electrons

Answer explanation

Atoms of the same element all have the same number of protons and electrons. What accounts for the differences in mass numbers?

Tags

NGSS.MS-PS1-1

Calcium has an atomic number of 20. What is the correct isotope symbol for calcium-44?

• A

• B

• C

• D

Answer explanation

Tags

NGSS.MS-PS1-1

Isotopes of the element uranium have different:

• numbers of protons.

• numbers of electrons.

• atomic numbers.

• atomic masses.

Answer explanation

The number of neutrons most likely to be found in a boron atom (#5) is:

• 3

• 5

• 6

• 11

Answer explanation

#neutrons = mass # - #protons

A deuterium atom has one neutron and a mass of ____ amu.

• 1

• 2

• 3

• 4

Answer explanation

Mass # = # protons + # neutrons

Which of the following is NOT an isotope of hydrogen?

• protium

• deuterium

• tritium

• hyperbium

Answer explanation

Tags

NGSS.HS-PS1-8

Isotopes of an element have different:

• atomic numbers

• numbers of protons

• numbers of neutrons

• numbers of electrons

Answer explanation

Additional information can be found here:

https://www.iaea.org/newscenter/news/what-are-isotopes

How many neutrons are in the isotope tritium?

• 0

• 1

• 2

• 3

Answer explanation