Year 12 in England

11th grade atoms, elements and the periodic table

3 11th grade atoms, elements and the periodic table skills, each with a worked example, free practice that checks every answer, and a printable worksheet. Start with a mixed review, or jump to the skill you need.

Mixed review

Ten questions drawn from every skill below.

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Percentage by mass of an element in a compound

CCSS NGSS.HS-PS1-7England: GCSE Combined Science: Quantitative chemistry

Example

What is the percentage by mass of carbon in carbon dioxide, CO₂? (Ar: C = 12, O = 16) Give 1 decimal place.

Mr = 44
12 ÷ 44 × 100 = 27.27
So the answer is: 27.3 %

Answer: 27.3 %

Builds on: Relative formula mass

Leads to: Find empirical and molecular formulae

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Balance alpha and beta decay equations

CCSS NGSS.HS-PS1-8England: GCSE Combined Science: Atomic structure (radioactivity) (nuclear equations)

Example

strontium-90 (mass number 90, atomic number 38) undergoes beta decay to form Y. What is the atomic number of the new nucleus?

A: 90 (unchanged); Z: 38 + 1 = 39
So the answer is: 39

Answer: 39

Builds on: Alpha, beta and gamma radiation, Atomic number, mass number and isotopes

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Nuclear fission and fusion

CCSS NGSS.HS-PS1-8CCSS NGSS.HS-ESS1-1England: GCSE Physics: Atomic structure (nuclear fission and fusion)

Example

Fission or fusion: used in today's nuclear power stations?

Fission splits a large nucleus into two smaller ones, releasing neutrons and energy.
So the answer is: fission

Answer: fission

Builds on: Alpha, beta and gamma radiation

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