Y9 atomic structure and PT alkali metals

Reorder the following group 1 metals from least reactive to most reactive:

• Na

• K

• Li

• Cs

• Fr

Group 1 metals react the same way because...

• they all have 1 electron in their outer shell

• they all sound the same

• they are all the same size atoms

• they have the same total number of shells

Group 1 metals all have one electron in their outer shell so they all become...

• +1 ions

• -1 ions

• +1 atoms

• -1 atoms

Group 1 is also known as the ______ ______

The alkali metals become more reactive as you go down the group

As you go down the group you add another ​ (a)   of electrons each time.

So the ​ (b)   shell electrons get further from the positively charged ​ (c)  

This means the attraction between the outer shell electrons and the positive nucleus is ​ (d)   and the outer shell electron is easier to ​ (e)   .

• shell
• outer
• nucleus
• weaker
• lose
• gain
• electrons
• stronger
• positively
• negatively

The alkali metals react with water to create metal hydroxide and hydrogen.

Reorder the following to describe the least reactive, lithium, on the left to most reactive on the right.

• Sinks

  Melts into a ball

  Explodes with a flame

• Fizzes quickly

  melts into a ball

  floats

  moves quickly

• Fizzes very quickly

  Melts into a ball

  Floats

  Moves very quickly

  Burns with lilac flame

• Fizzes slowly

  Floats

  Moves slowly

Match the following reactions:

• add a lit splint you will get a squeaky pop

• potassium + water →

• lithium hydroxide + hydrogen

• lithium + water →

• sodium hydroxide + hydrogen

• when potassium is added to water is ignites with a...

• potassium hydroxide + hydrogen

• to test for hydrogen...

• lilac flame

• sodium + water →

Tags

NGSS.MS-PS1-2

Match the following:

• 2Na₂O

• sodium + water →

• sodium chloride

• 2Na + 2H₂O →

• sodium oxide

• sodium + oxygen →

• 2NaOH + H₂

• sodium + chlorine

• sodium hydroxide + hydrogen

• 2Na + O₂ →

Tags

NGSS.MS-PS1-2

Match the following electron configurations:

• 2,8,1

• Li

• 2,1

• K

• 2,8,8,1

• Na

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these is NOT a physical property of the alkali metals?

• are soft and can be cut with a knife

• low density

• low melting point

• hard