Atomic Structure and Isotopes

Atomic Structure of Isotopes

Atomic Notation

An Atomic Notation is a shorthand way of writing the structure of the atom showing the atomic number, atomic mass and the atomic symbol

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What is an Atomic Notation?

What is an Atomic Notation

Multiple Choice

How many protons does this atom of beryllium have?

• 9

• 4

• 5

• 2

Multiple Choice

What number should be written under the 32 in this atomic notation for sulfur?

• -1

• 16

• 17

• 32

Multiple Choice

In a correctly written atomic notation what would be located in the "A" position?

• number of neutrons

• number of electrons

• atomic number

• Atomic Mass

Multiple Select

Which explanation of this atomic notation is correct? (Choose all correct answers.)

• the 12 is the number of protons + neutrons

• the 6 tells you there are 6 protons

• the 12 is the number of nucleons

• the 6 is the atomic number

Multiple Choice

• 1

• 2

• 3

• 4

The nucleus of the atom

The nucleus of an atom contains protons and neutrons.

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The nucleus of the atom

Adding up all the protons and neutrons in the nucleus gives us the atomic mass

# of protons + # of neutrons = Atomic Mass

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The nucleus of the atom

Multiple Choice

Which 2 subatomic particles are found in the nucleus of an atom?

• electrons and photons
• protons and electrons
• neutrons and electrons
• protons and neutrons

Naming Isotopes

Isotopes are atoms that have the same number of protons and electrons, but a different number of neutrons.


The number of neutrons can change leading to ISOTPES of that element.

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What are Isotopes?

Changing the number of neutrons changes the mass of the element


Isotopes are identified by their mass, which is the total number of protons and neutrons.

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What are Isotopes?

There are two ways that isotopes are generally written.

The first way is to put the mass as a superscript before the symbol of the element:

Naming Isotopes

The second way is to write out the element name and then write the mass after a dash next to the element's name:

Naming Isotopes

Hydrogen is the only elements whose isotopes have specific name

Hydrogen's Isotopes

All elements have a number of isotopes. Hydrogen has the fewest with 3.

Cesium and Xenon has the most isotopes with 36.

How many isotopes can an element have?

Multiple Choice

1) What particle determines the atomic number of an atom?

• mass number

• atomic number

• number of protons

• number of electrons

Multiple Choice

2) Atoms always have the same number of what two atomic particles?

• Neutrons and neutrinos

• Neutrons and protons

• Electrons and protons

• Electrons and quarks

Multiple Choice

3) The number of what atomic particle changes between different isotopes of the same element?

• Neutron

• Electron

• Proton

• Nucleus

Multiple Choice

4) What characteristic of an element differs between isotopes?

• Positive charge

• Negative charge

• Mass

• All of the Above

Multiple Choice

5) In the isotope Carbon-14, what does the number 14 represent?

• The total charge

• The number of electrons

• Mass of the atom

• All of the above

• None of the Above

Multiple Choice

6) True or False: Most elements only have 1 or 2 isotopes and several elements do not have any isotopes.

• True

• False

Calculating the number of neutrons in an aton

Multiple Choice

• 1

• 2

• 3

• 4