Revisiting the Basic Concepts on Atoms

Revisiting the Basic Concepts on Atoms

​LEARNING TARGETS

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I can define what an atom is.​

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​I can recall the subatomic particles in an atom.

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​I can determine certain information about an atom/ion such as atomic number, mass number, and net charge, based on the number of its subatomic particles.

Open Ended

What are the ideas that come to your mind whenever you hear the term atom?

ATOM: DEFINED

Atom is the basic unit of matter that retains the physical and chemical properties of a substance or any form of matter.

Multiple Choice

The word atom is derived from the Greek word "atomos" which means "indivisible". Are atoms really indivisible?

• Yes, atoms are INDIVISIBLE.

• No. That's an ancient misconception.

​particle accelerator, a.k.a. "atom smasher"

THE SUBATOMIC PARTICLES

Multiple Select

Which two subatomic particles are considered in calculating for the MASS NUMBER of an atom?

• electron

• neutron

• proton

Open Ended

Why are electrons disregarded in calculating for the mass number of a given atom?

Why are electrons disregarded in calculating for the mass number of a given atom?

The mass of an electron is negligible compared to the mass of a proton or a neutron.

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ATOMIC KEY CONCEPTS TO REMEMBER

​(RECALL OF JHS CHEMISTRY CONCEPTS)

Multiple Choice

What is the mass number of an element with the following subatomic particles?

protons = 35

neutrons = 45

electrons = 35

• 35

• 70

• 80

Multiple Choice

What is the atomic number of an element with the following subatomic particles?

protons = 35

neutrons = 45

electrons = 35

• 35

• 45

• 70

• 80

Multiple Choice

What is the net charge of an element with the following subatomic particles?

protons = 35

neutrons = 45

electrons = 35

• zero

• 35

• 45

• 70

Multiple Choice

What is the mass number of an element with the following subatomic particles?

protons = 10

neutrons = 9

electrons = 10

• 10

• 19

• 20

Multiple Choice

What is the atomic number of an element with the following subatomic particles?

protons = 10

neutrons = 9

electrons = 10

• 9

• 10

• 19

• 20

Multiple Choice

What is the net charge of an element with the following subatomic particles?

protons = 83

neutrons = 126

electrons = 80

• +3

• -3

• zero

• +46

Multiple Choice

What is the net charge of an element with the following subatomic particles?

protons = 7

neutrons = 7

electrons = 10

• -3

• +3

• +17

• zero

Open Ended

Is there anything that you would like to further learn about ATOMS and MATTER in the next meetings to come? If yes, what would that be?