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Combined Science: Physics

GCSE · Edexcel · foundation

QuestionsFlashcards

Expressing Quantities & SI Units
- Units & Prefixes
  8
- Conversions & Standard Form
  6

Atomic Structure
Radioactive Decay
Dangers of Radiation
- Dangers of Radiation
  5
- Contamination & Irradiation
  6

Magnetism
Electromagnetism & The Motor Effect
- Magnetic Fields in Wires
  6
- Magnetic Fields in Solenoids
  6

Transformers & the National Grid
- The National Grid
  5
- The Ideal Transformer Equation
  3

Positive Ions Flashcards

All 4 cards in this deck

Why does an atom have no overall charge?: It has the same number of electrons as protons, so the negative and positive charges are equal.
How does an atom form a positive ion?: By losing one or more of its outer electrons.
What is the charge on an ion formed when an atom loses two outer electrons?: +2, because there are now two more protons than electrons.
True or false? An atom becomes a positive ion by gaining protons.: False. It loses outer electrons; the number of protons in the nucleus does not change.