Reactivity of an Element

Group 1 on the PTE. One valence electron that is easily removed to form a POSITIVE ION. Highly reactive and form stable compounds.

• Alkali metals

• Alkali Earth metals

• Halogens

• Noble gasses

contains non metals, 7 valence electrons in it's outermost energy level. Very reactive. Group 17

• Noble Gasses

• Alkali Metals

• Halogens

• Alkali Earth Metals

a pure substance made of only one kide of atom

• molecule

• element

• compound

• Halogens

When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?

• The total number of neutrons in the unknown element

• The total number of particles in the nucleus of the unknown element

• The number of protons in the nucleus of the unknown element

• The number of valence electrons in the unknown element

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A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristics of calcium is most closely related to its chemical reactivity?

• The 20 protons in each atom of calcium

• The density of calcium

• The atomic number

• The two valence electrons in each atom of calcium

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NGSS.HS-PS1-1

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What part of the atom determines the chemical properties or reactivity?

• Protons

• Electrons

• Valence Electrons

• Energy levels

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NGSS.HS-PS1-1

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The atoms of a certain element each contain 9 protons and 7 valence electrons. Which statement correctly identifies this element and describes the chemical reactivity?

• The element is oxygen, and is highly reactive.

• The element is fluorine, and is highly reactive.

• The element is oxygen, and is not very reactive.

• The element is fluorine, and is not very reactive.

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NGSS.MS-PS1-1

What groups are the most reactive metals?

• 2 and 3

• 1 and 18

• 1 and 2

• 16 and 17

What groups are the most reactive non metals?

• 1 and 2

• 16 and 17

• 2 and 17

• 1 and 16

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?

• 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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NGSS.MS-PS1-2