Periodic Table

Question 1

What changes when moving top to bottom down the periodic table?

Answer 1

• Proton number increases not consecutively
• Number of electron shells increases consecutively

Question 1

What changes when we move left to right across the periodic table?

Answer 1

• Proton Number increases consecutively
• Number of valence electrons increases consecutively
• Different chemical properties
• Elements change from metals to non-metals

Question 2

How does reactivity change when going down group 1 (alkali metals)

Answer 2

Reactivity increases

Question 3

State physical properties of alkali metals.

Answer 3

• Lower melting points and boiling points compared to other metals
• Lower density compared to other metals
• Soft (Able to cut easily)
• Shiny silvery solids
• Conducts Electricity

Question 4

State the chemical properties of alkali metals.

Answer 4

• Strong alkalis
• turns colour of universal indicator green to violet

Question 5

State the observations made when sodium reacts with water.

Answer 5

• Sodium dart around the surface of water (less dense than water)
• Fizzing/Effervescence can be observed

Question 6

State the trends going down group 1

Answer 6

• Melting Point Decreases
• Reactivity increases
• Density increases (except potassium)

Question 7

Why does reactivity of alkali metals increasing going down the group.

Answer 7

Atomic size of elements increase, Increase in number of electron shells. → Attraction between positively charged nucleus and valence electrons decreases as valence electrons are further away from the nucleus. → Easier to lose the valence electron going down the group.

Question 8

List Halogens (Group 17) from most reactive to least

Answer 8

• Flourine
• Chlorine
• Bromine
• Iodine
• Astatine
• Tennessine