How many different elements are there?

• Around 1000

• Around 200

• Around 100

Number of protons =

• number of neutrons

• mass number

• number of electrons

Choose the BALANCED equation

• Mg + O2 -> MgO

• 2Mg + O2 -> 2Mg0

• Mg + O2 -> 2MgO

Methods of extracting copper like Bioleaching and Phytomining are good because....

• High grade copper ores don't exist

• High grade copper ores are running out

• Demand for copper is decreasing so other methods are too large scale

Which of these is an alloy?

• Silver

• Bronze

• Gold

On the second electron shell (when showing an element's electronic structure) there can be up to....

• 2 electrons

• 4 electrons

• 8 electrons

If neon has 10 protons, which diagram correctly shows its electronic structure?

If neon has 10 protons, which diagram correctly shows its electronic structure?