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3 - Atomic Structure

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✅EvaluateQuestion 1 of 21

Which subatomic particle has a positive charge?

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✅EvaluateQuestion 2 of 21

What is the total number of electrons in a neutral atom of carbon?

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✅EvaluateQuestion 3 of 21

The nucleus of an atom contains:

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✅EvaluateQuestion 4 of 21

The particle with the smallest mass is the:

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✅EvaluateQuestion 5 of 21

The atomic number of an element represents the number of:

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✅EvaluateQuestion 6 of 21

The mass number of an atom is equal to the:

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✅EvaluateQuestion 7 of 21

Which of the following atoms has 2 electrons in its outer shell?

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✅EvaluateQuestion 8 of 21

The electronic configuration of sodium (Na, Z = 11) is:

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✅EvaluateQuestion 9 of 21

Which statement best explains why atoms are electrically neutral?

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✅EvaluateQuestion 10 of 21

A chlorine atom has 17 protons and 18 neutrons. What is its mass number?

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✅EvaluateQuestion 11 of 21

Which of the following pairs are isotopes of the same element?

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✅EvaluateQuestion 12 of 21

When a neutral atom loses one electron, it becomes:

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✅EvaluateQuestion 13 of 21

A radioactive isotope of carbon is used in dating ancient artefacts. Which isotope is it?

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✅EvaluateQuestion 14 of 21

Which type of radiation has the greatest penetrating power?

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✅EvaluateQuestion 15 of 21

A calcium atom (Z = 20) loses two electrons to form Ca²⁺. Its new electronic configuration is:

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✅EvaluateQuestion 16 of 21

The number of neutrons in the isotope ³⁷Cl is:

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✅EvaluateQuestion 17 of 21

When a beta particle is emitted from a radioactive nucleus, the new element formed will have:

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✅EvaluateQuestion 18 of 21

Which statement best describes the difference between isotopes of chlorine?

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✅EvaluateQuestion 19 of 21

A sample of air contains radioactive argon with 18 protons and 22 neutrons. Which isotope is this?

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✅EvaluateQuestion 20 of 21

Why are alpha particles less penetrating than gamma rays?

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✅EvaluateQuestion 21 of 21

Which statement correctly links atomic structure to chemical behaviour?

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✅EvaluateQuestion 1 of 21

Which subatomic particle has a positive charge?

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