Re-Quiz - Isotopes and Average Atomic Mass

What does the atomic number tell us? (select all correct answers)

• the number of protons

• the number of protons and electrons

• the number of protons and neutrons

• the number of neutrons

Atoms of the same element which have a different number of neutrons are called .

(a)  

• isotopes
• ions
• quarks
• molecules

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

Mathematical Equivalence

ON

How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)12

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu

• 24.97 amu

• 75.01 amu

• 74.51 amu

What does the 1.00794 stand for?

• Hydrogen

• atomic number

• atomic mass

• atomic explosion

Tags

NGSS.HS-PS1-1

What is the atomic number for an element with three protons?

• 2

• 1

• 3

• 6

An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to

• 2 amu

• 3 amu

• 4 amu

• 5 amu

How many neutrons does the isotope of lithium have?

• 8

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

How many protons does this isotope of titanium have?

• 48

• 22

• 26

• 70