Calculating Average Atomic Mass and Isotopes Quiz

Compute the average atomic mass for silicon:

• 27.977
• 28.09
• 28.976
• The average mass cannot be determined from provided information.

Calculate the average atomic mass of silver.

• 106.38649amu
• 111.91896amu
• 107.8677amu
• 121

Calcium has the atomic number 20. If it has a mass number of 46, how many neutrons are present?

• 46

• 20

• 26

• We cannot tell

When two atoms of the same element have different masses, they are called ______, and have a different number of ______.

• Neutrons; Isotopes

• Atoms; Isotopes

• Isotopes; Protons

• Isotopes; Neutrons

Which subatomic particle has a negative charge in the atom?

• proton

• neutron

• electron

• quark

How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)

• Sodium has 1 proton.

• Sodium has 3 protons.

• Sodium has 11 protons

How many neutrons does C-14 contain? (tap to enlarge the image)

• 6

• 7

• 14

• 8

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70