Families of elements and their properties
Grade 10 Science Worksheet
Circle the best answer, or write your answer on the line.
Potassium melts at 336.53 K and cesium at 301.59 K (PubChem). Rubidium sits between them. What melting point does the average predict for rubidium, Ari?
Chlorine boils at 239.11 K and iodine at 457.55 K (PubChem). Bromine sits between them. What boiling point does the average predict for bromine, Bo?
Using the table, which halogen is a liquid at room temperature, Jun?
- Bromine
- Iodine
- Chlorine
Using the table, what do all four halogens share, Luz?
Use the picture in question 3.
- The same state
- 7 valence electrons
- The same boiling point
Read this first
Short reading (Chemguide)
Every alkali metal reacts with water, giving a solution of the metal hydroxide and hydrogen gas. The reactions get more vigorous going down group 1, because the single outer electron is held less tightly. This is a fact to read, not something to try.
In the reading, what do alkali metals form with water, Milo?
- Sugar and water
- A hydroxide and hydrogen gas
- Salt and oxygen gas from the air
In the reading, which reacts more vigorously with water, lithium or potassium, Noah?
- Potassium, lower in group 1
- They are equal
- Lithium, which is higher in group 1
In the reading, why does reactivity rise going down group 1, Pia?
- The atoms get smaller as you go down the group
- The metals get colder
- The outer electron is held less tightly
Why are noble gases used where something unreactive is needed, Ren?
- They are metals
- They are far too heavy to move around
- Their full shells make them unreactive
Where are the transition metals on the table, Tala?
- Group 18
- Group 1
- Groups 3–12, the d block
Copper is a transition metal used in wires. Which property makes it useful there, Zee?
- It dissolves in water
- It conducts electricity
- It is a gas