Exploring Average Atomic Mass Concepts

What defines the identity of an element?

• Number of protons

• Number of neutrons

• Atomic mass

• Number of electrons

How many neutrons does the first isotope of hydrogen have?

• 3

• 2

• 1

• 0

Tags

NGSS.MS-PS1-1

What is the mass number of the second isotope of hydrogen?

• 1

• 2

• 3

• 4

How many neutrons are present in the third isotope of hydrogen?

• 2

• 1

• 3

• 0

What is the atomic number of lithium?

• 5

• 4

• 3

• 2

How many neutrons are in lithium-6?

• 3

• 5

• 2

• 4

Why is the atomic mass on the periodic table not a whole number?

• It is an average of the masses of all isotopes

• It is rounded to the nearest whole number

• It includes the mass of electrons

• It includes the mass of protons only

What is the average atomic mass of lithium-6 and lithium-7?

• 6.5

• 6.67

• 6.75

• 6.91

Which isotope of hydrogen is nearly 100% abundant?

• Hydrogen-1

• Hydrogen-2

• Hydrogen-3

• Hydrogen-4

What is the most abundant isotope of carbon?

• Carbon-12

• Carbon-14

• Carbon-11

• Carbon-13