Identity and Reactivity

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristics of calcium is most closely related to its chemical reactivity?

• The 20 protons in each atom of calcium

• The density of calcium

• The atomic number

• The two valence electrons in each atom of calcium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What groups are the most reactive metals?

• 2 and 3

• 1 and 18

• 1 and 2

• 16 and 17

What groups are the most reactive non metals?

• 1 and 2

• 16 and 17

• 2 and 17

• 1 and 16

Which two groups on the Periodic Table are the MOST reactive?

• Group 1 and Group 17

• Group 2 and Group 16

• Group 13 and Group 15

• Group 17 and Group 18

Which of the following is MOST reactive?

• Lithium

• Lead

• Tin

• Copper

How many valence electrons are elements trying to reach in their outer shells?

• 1

• 2

• 5

• 8

What determines the reactivity of an element?

• Size of its nucleus

• Number of total electrons

• Number of valence electrons

• Number of shells

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How do you determine the number of valence electrons an element has?

• Look at its period

• Look at its group

• Look at its atomic number

• Look at its atomic mass

What are valence electrons?

• The total number of electrons in an atom

• The number of electrons in the outermost shell

• The number of electrons in the second shell

• The number of protons in the outermost shell

Which elements have the most similar chemical properties?

• boron and carbon

• oxygen and sulfur

• aluminum and bromine

• argon and silicon