Periodic Table Questions

Based on these drawings, which element is the least reactive?

• Chlorine (Cl) because it has three energy levels and seven electrons in the third level

• Krypton (Kr) because it has four energy levels and eight electrons in the fourth level

• Zinc (Zn) because it has four energy levels and two electrons in the fourth level

• Sodium (Na) because it has three energy levels and one electron in the third level

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Based on the information in the table, which conclusion could be made about the reactivity of these elements?

• Boron is the most reactive because it has the most protons

• Fluorine is the most reactive because it has 7 electrons in the outer shell

• Silicon is the most reactive because it has an equal number of protons and neutrons

• Gallium is the most reactive because it has many more neutrons than protons

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A student is studying sodium, a highly reactive metal that humans need to regular water balance in their bodies. Which characteristic of sodium is most closely related to its chemical reactivity?

• The 11 protons in each atom of sodium

• The density of sodium, which is 0.971 g/cm³

• The atomic mass of sodium, which is 22.990 amu

• The 1 valence electron in each atom of sodium

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NGSS.HS-PS1-2

Which table was completed correctly?

• A

• B

• C

• D

• A

• B

• C

• D

How many elements are in the Periodic Table of Elements?

Label the diagram!

b

a

c

d

Chemical symbol

Atomic mass

Element name.

Atomic number

Label the element with the correct terms

a

b

c

d

Atomic number

Atomic Mass

Element Symbol

Element Name

When elements are in the same ROW they are all in the same-

• Chemical Symbol

• Period

• Family

Element or Not an Element? Is this on the periodic table??

• Yes

• No

• Possibly depending on the temperature

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