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SingaporeCombined ScienceQuick questions
Chemistry: Atoms, Bonding and the Mole
Quick questions on Atomic structure explained: O-Level Combined Science
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the structure of the atom?Show answer
An atom has a tiny central nucleus containing protons and neutrons, surrounded by electrons in shells (energy levels). The relative charges and masses are:
What are isotopes?Show answer
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. They have the same proton number but different nucleon numbers. Because they have the same electron arrangement, isotopes have identical chemical properties.
What is q1?Show answer
State the relative charge and relative mass of a neutron. [2 marks]
What is q2?Show answer
An atom has proton number and nucleon number . Find the number of neutrons. [1 mark]
What is q3?Show answer
Explain why magnesium () is placed in Group II of the periodic table. [2 marks]
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