Unit 4 Periodic Table

All of the following are chemical families EXCEPT ___.

• Gases

• Halogens

• Noble gases

• Alkali metals

Why are the elements in Group 8A (18) called Noble gases?

• They were discovered by the royal family.

• They are more valuable than other gases.

• They rarely take part in a reaction.

• They are highly reactive.

What is the name of this chemical family?

• Noble gases

• representative elements

• alkali metals

• alkali earth metals

Define electron affinity.

• The amount of energy related to add an electron to an atom.

• The amount of energy related to remove an electron from an atom.

• the distance between two nuclei of identical atoms

Sodium ion

• Na²⁺
• K²⁺
• Li⁺
• Na⁺

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Why do ionic bonds form?

• so the number of protons equals the number of electrons
• to fill the outermost energy level
• so an atom can become unstable

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What are ionic bonds?

• valence electrons transferred between atoms
• Inner most electrons transferred between atoms

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When the number of electrons equals the number of protons the atom has what charge?

• sponge bob
• positive charge
• negative charge
• neutral charge

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If an aluminum atom has 13 protons (+) and 10 electrons (-), what is it's charge?

• Al³⁺
• Al¹³⁺
• Al¹⁰⁺
• Al^10-

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Which of these is a property of metals?

• It's malleable
• It can't conduct electricity
• They are used in food
• It's very brittle