8.P.1.2 Periodic Table (Test Prep Ready)

Who is credited with developing the first widely recognized periodic table of elements in 1869?

• Isaac Newton

• Albert Einstein

• Charles Darwin

• Dmitri Mendeleev

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8.P.1.2

What is the primary factor that differentiates one element from another in terms of it's atomic structure.

Use Atomic Structure notes to answer, if needed. If missing this information, please add to reference section of your binder.

• number of protons

• number of electrons

• number of neutrons

• number of quarks

Answer explanation

If it's an atom that has 79 protons, it's ALWAYS gold. If an atom of gold gains a proton, then it's no longer gold it's mercury. That's not the case for neutrons and electrons. An atom of gold may have varying number of neutrons and electrons.

In each element’s square on the periodic table, a whole number is shown. What does this whole number represent?

• atomic mass

• atomic mass

• number of isotopes

• number of electrons

The element sodium appears like this in the periodic table. Which is its atomic mass?

Use How to Read a Periodic Square notes, if needed. If missing this information, please add to reference section of your binder.

• 11

• Na

• sodium

• 22.990

Answer explanation

Atomic mass is the average mass of all known isotopes (atoms of one element that have differing number of neutrons), so it is often represented as decimal number.

In the modern periodic table, how are elements organized?

• by the date each element was discovered

• by increasing atomic mass

• by increasing atomic number

• by alphabetical order of their symbols

Properties such as magnetism, luster, and malleability have been used to group together which category of elements on the periodic table?

Use Metals, Metalloids, and Nonmetals notes, if needed. If missing this information, please add to reference section of your binder.

• metals

• nonmetals

• metaloids

• noble gases

If a highly-reactive metal with one valence electron is discovered, in which group would the element best fit?

Use Periodic Table notes, if needed. If missing this information, please add to reference section of your binder.

• group 1

• group 2

• group 17

• group 18

In which groups did Mendeleev most likely place highly-reactive elements?

Use Periodic Table Key notes, if needed. If missing this information, please add to reference section of your binder.

• group 1 (IA) and group 17 (VIIA)

• group 1 (IA) and group 18 (VIIIA)

• group 2 (IIA) and group 18 (VIIIA)

• group 2 (IIA) and group 17 (VIIIA)

Which best explains how the periodic table is used to identify properties of elements?

Use Periodic Table Key notes, if needed. If missing this information, please add to reference section of your binder.

• by the color and shape of the elements

• by the number of electrons in the elements

• by the group in which the elements are located

• by the atomic mass of the elements

On the periodic table, where are the most reactive metals found?

• In the bottom rows, connecting the main table to the separated rows

• In the column on the far right side

• In the column on the far left side

• In the top row