Unit 7- Atomic Structure Review

Match the Following

• The smallest unit of an element that keeps the element’s chemical properties.

• Nucleus

• Positively charged particles found in the nucleus of an atom.

• Element

• A substance that cannot be broken down into simpler substances by chemical means.

• Atom

• Particles with a neutral charge found in the nucleus of an atom.

• Proton

• The dense center of an atom containing protons and neutrons.

• Neutron

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Match the following

• Horizontal rows of elements that have the same number of electron shells. 

• 15) Metal

• Elements that are malleable, ductile, and good conductors; typically shiny.

• Period

• All known elements arranged in order by atomic number.

• Atomic Mass/Mass Number

• The average number of protons and neutrons in one atom of an element.

• Family/Group

• Vertical columns of elements that have the same amount of valence electrons.

• Periodic Table

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Match the following

• Elements that are ductile, malleable, and have luster.

• Metal

• An element that has properties that fall between metals and nonmetals.

•  Nonmetal

• Elements that are brittle, poor conductors, and have low melting and boiling points.

• Metalloid

Using a periodic table (you can use the one in the textbook) order the following elements by # of valence electrons, least to greatest.

• Barium

• Oxygen

• Potassium

• Neon

• Carbon

How many electron shells does the pictured atom have?

• 1

• 2

• 3

• 4

How many valence electrons does the pictured atom have?

• 20

• 3

• 2

• 4

The atomic number identifies the number of __________.

• electrons

• atoms

• protons

• neutrons

Subatomic particles that have a negative charge

• electrons

• protons

• quarks

• neutrons

The number 16 for the atomic element sulfur is the

• ionic number

• isotope

• atomic mass

• atomic number

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How many electrons does sulfur have

• 16

• 32

• 48

• 12

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