Average Atomic Mass and Chemical Bonds

The atomic mass of an element is the ___.

• average of the mass number and the atomic number for the element

• weighted average of the masses of the isotopes of the element

• total mass of the isotopes of the element

• total number of subatomic particles in the nucleus

The atomic mass of an element depends upon the ___.

• relative abundance of protons in that element

• mass and relative abundance of each isotope of that element

• mass of each isotope of that element

• mass of each electron in that element

What is the function of mass spectrum?

• to determine atomic mass of an element

• to show the number of isotopes present in an element

• to determine the boiling point of an element

• to show the relative abundance of each isotope

What does the 1.0079 stand for?

• atomic number

• hydrogen

• atomic mass

• mass number

Tags

NGSS.HS-PS1-1

Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?

• Cl-35

• Cl-37

• Cannot be determined from the information provided.

Copper consists of 2 isotopes ⁶³Cu and ⁶⁵Cu and has a relative atomic mass of 63.55. What is the most likely composition. 
⁶³Cu                             ⁶⁵Cu

• 30%    70%
• 50%    50%
• 55%    45%
• 70%   30%

Magnesium exists as the three isotopes shown. What is the average atomic mass of magnesium?

• 20.74 amu

• 22.56 amu

• 18.39 amu

• 24.31

What is the average atomic mass for this element?

• 10 amu
• 10.8 amu
• 19.9 amu
• 11 amu

According to the mass spectrum given, how many isotopes does zirconium has?

The figure shows the mass spectrum of zirconium, Zr. Choose the most abundant isotopes.

• ⁹Zr

• ⁹⁰Zr

• ⁵²Zr

• ⁹¹Zr