C1 & C3 Rocket sheet quiz

What is the chemical symbol for the element potassium?

• P

• K

• Po

• Ts

Approximately how many elements are there?

• 40

• 80

• 120

• 160

Sodium chloride is an example of which of these?

• a compound

• a mixture

• a molecule

• an element

NaOH does not contain which of these elements?

• oxygen

• nitrogen

• sodium

• hydrogen

What size is the radius of an atom?

• 0.1 nm

• 10 nm

• 1 x 10^-9 m

• 1 x 10^-12 m

How many times bigger is the radius of an atom compared to the radius of an atomic nucleus?

• 100

• 1000

• 10,000

• 100,000

What is the relative mass of an electron?

• 0.1

• 1

• very small

• 1 x 10^-14

Different isotopes of the same element have a different number of what?

• protons

• neutrons

• electrons

• electron shells

How many neutrons are in an atom of 81Br?

• 45

• 35

• 36

• 46

How many electrons does the ion Mg²⁺ have?

• 8

• 10

• 12

• 14