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This question is about the structure of an atom of polonium.

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What is the atomic number of polonium?

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209

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What is the mass number of polonium?

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What is the number of neutrons in the polonium nucleus?

209

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What is the number of electrons in an atom of polonium?

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What is the overall charge of an atom of polonium?

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The student's diagram is wrong.

Explain why the diagram is wrong.

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protons are positively charged

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protons should be in the nucleus

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electrons are negatively charged

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electrons should be in the shells around the nucleus

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An ion of magnesium has 12 protons in the nucleus and 10 electrons in orbital shells.

Calculate the relative charge on the ion.

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Magnesium-23 is an isotope.

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number of neutrons = 23 - 12 = 11

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This question is about isotopes and the structure of the atom.

The diagram below shows the nucleus of a lithium atom.

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Describe the structure of the nucleus above.

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3 protons

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Atoms - History, Structure & Isotopes - exam practice

Atoms - History, Structure & Isotopes

Question 1 of 3

Atoms - History, Structure & Isotopes - exam practice

Atoms - History, Structure & Isotopes

Question 1 of 3