8.5 c periodic table

 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.
  

Elements arranged in vertical columns in the periodic table are called periods.

• true
• false

The atomic number of an element is determined by its number of protons.

• true
• false

what does the 6 represent?

• Atomic mass
• atomic number
• chemical symbol
• element name

which family of metals is most reactive?

• transition metals
• boron family 
• alkali family 
• noble gases

most of the elements on the periodic table are 

• non metals 
• metals 
• metalloids 
• none 

moving left to right across the periodic table, the size of an atom.....

• increases
• decreases

Beryllium is in group number______.

• Group 2
• Group 3
• Group 4
• Group 7

Tags

NGSS.HS-PS1-1

The period for Bromine is ___________.

• 3
• 2
• 4

Tags

NGSS.HS-PS1-1

How many Valance electrons does Iodine Have?

• 6
• 16
• 7
• 17

Tags

NGSS.HS-PS1-1