Chemistry

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Isotopes

Define an isotope, and compare isotopes of elements. Calculate relative atomic mass using isotopic abundances.

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Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which subatomic particle can be lost or gained when elements react?

1/6

Q2.Where in the atom are neutrons found?

2/6

Q3.What is the relative mass and charge of a neutron?

3/6

Q4.An element has 11 protons and 12 neutrons. What is its atomic mass?

4/6

Q5.An element an atomic number of 13 and a mass number of 27. How many protons, neutrons and electrons does it have?

5/6

Q6.Atoms have a neutral charge because …

6/6

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which subatomic particle can be lost or gained when elements react?

1/6

Q2.Where in the atom are neutrons found?

2/6

Q3.What is the relative mass and charge of a neutron?

3/6

Q4.An element has 11 protons and 12 neutrons. What is its atomic mass?

4/6

Q5.An element an atomic number of 13 and a mass number of 27. How many protons, neutrons and electrons does it have?

5/6

Q6.Atoms have a neutral charge because …

6/6

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Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Isotopes

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What are isotopes?

1/6

Q2.__________ have the same chemical properties but different physical properties.

2/6

Q3.Carbon-14 has more neutrons than carbon-12.

Fill in the blank.

3/6

Q4.Match the words about atoms with the definitions.
  • atomic number
  • mass number
  • isotope
  • neutron
  • isotopic abundance
  • a particle with no charge
  • amount of a naturally occurring isotope
  • number of protons
  • atoms with different numbers of neutrons but same number of protons
  • number of protons plus neutrons

Where you see this icon you can drag and drop! If you are using your keyboard select and move using space and the arrow keys.

4/6

Q5.A sample of naturally occurring lithium is 92.4% Li-7 and 7.6% Li-6. What is its relative atomic mass?

5/6

Q6.Of these four atoms, which two are isotopes?

Select two (2) boxes

6/6

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

Isotopes

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What are isotopes?

1/6

Q2.__________ have the same chemical properties but different physical properties.

2/6

Q3.Carbon-14 has more neutrons than carbon-12.

Fill in the blank.

3/6

Q4.Match the words about atoms with the definitions.
  • atomic number
  • mass number
  • isotope
  • neutron
  • isotopic abundance
  • a particle with no charge
  • atoms with different numbers of neutrons but same number of protons
  • amount of a naturally occurring isotope
  • number of protons
  • number of protons plus neutrons

Where you see this icon you can drag and drop! If you are using your keyboard select and move using space and the arrow keys.

4/6

Q5.A sample of naturally occurring lithium is 92.4% Li-7 and 7.6% Li-6. What is its relative atomic mass?

5/6

Q6.Of these four atoms, which two are isotopes?

Select two (2) boxes

6/6

Lesson summary: Isotopes

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Atomic structure and the periodic table
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