Intervention 8.5B

An element can be identified by its unique number of –

• ions
• electrons
• protons
• neutrons

The reactivity of an atom is determined by –

• its number of valence electrons
• the radius of the atom's nucleus
• its atomic mass of the element
• the orbital path of its electrons

Copper’s atomic number is 29. This means that copper has -

• 29 protons in its nucleus
• 29 atoms in every molecule
• a boiling point of 29 degrees Celsius
• an atomic radius of 29 micrometers

The table provides information for four elements. Based on the information shown, it can be concluded that - 

• carbon was discovered first
• iodine is the most reactive
• oxygen has the most neutrons
• nitrogen is the better insulator

Tags

NGSS.HS-PS1-1

The table provides information on four different elements. Which element has four protons in its nucleus?

• Lithium
• Carbon
• Beryllium
• Helium

 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

most of the elements on the periodic table are 

• non metals 
• metals 
• metalloids 
• none