Exploring Atoms and Isotopes Practice

What is an isotope?

• An atom with a different number of protons

• An atom with a different number of neutrons

• An atom with a different number of electrons

• An atom with a different number of protons and electrons

Tags

NGSS.HS-PS1-8

• 35.45 amu

• 36.00 amu

• 35.00 amu

• 34.50 amu

How many significant figures are in the number 0.004560?

• 3

• 4

• 5

• 6

Express the number 0.00032 in scientific notation.

Which of the following isotopes has the greatest atomic mass?

Tags

NGSS.HS-PS1-8

If an element has isotopes with masses 10 amu (20% abundance) and 11 amu (80% abundance), what is its average atomic mass?

• 10.2 amu

• 10.8 amu

• 10.5 amu

• 11.0 amu

How many significant figures are in the measurement 0.007890?

• 3

• 4

• 5

• 6

Convert the number 5,600,000 into scientific notation.

Which isotope of oxygen is the most abundant if the average atomic mass is 15.999 amu?

Calculate the average atomic mass of an element with isotopes of masses 20 amu (50% abundance) and 22 amu (50% abundance).

• 21 amu

• 20.5 amu

• 22 amu

• 20 amu