Atomic Structure Valence Electrons Periods and Groups Counting Atoms

A student drew a dot cross diagram with 7 valence electrons. Which of the following elements might have the student drawn?

• Cl (Chlorine)

• Ne (Neon)

• N (Nitrogen)

• Li (Lithium)

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NGSS.HS-PS1-1

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

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NGSS.HS-PS1-1

Elements which are shiny, conduct electricity and heat are called

• metal
• nonmetal
• metalloid
• nonexistent

Group 18 elements are known as the _____ _____ and have full valence shells.

• royal gases.
• supreme solids.
• noble gases.
• legit liquids.

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NGSS.HS-PS1-1

Which elements have the most similar chemical properties?

• K and Na
• K and Ca
• K and Cl
• K and S

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NGSS.HS-PS1-2

Rows on the period table are called _____ while columns are called _____.

• groups, families
• groups, periods
• periods, groups
• families, groups

The central region of an atom where its neutrons and protons are is called the

• nucleus 
• electron cloud
• core 
• center 

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NGSS.HS-PS1-8

 Why does group number 18 have the least reactive elements?

• They all have an odd number of protons.
• They all have an even number of protons. 
• They have the largest masses.
• Their electron shells are the most filled and do not need to be very reactive.
  

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The period for Bromine is ___________.

• 3
• 2
• 4

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NGSS.HS-PS1-1

What is the atomic mass of "F"

• 9
• 18
• 17
• 19