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SingaporeChemistryQuick questions
Atomic Structure and Bonding
Quick questions on Atomic structure and electron shells: N(A)-Level Chemistry
6short 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, with electrons moving around it in shells (energy levels). The three particles 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 number and arrangement of electrons, isotopes have the same chemical properties; they differ only slightly in mass.
What are drawing electron shell arrangements?Show answer
Electrons fill shells from the inside out, and each shell holds a maximum number:
What is q1?Show answer
An atom has a proton number of and a nucleon number of . State the number of protons, neutrons, and electrons. [3 marks]
What is q2?Show answer
Draw or write the electron arrangement of a magnesium atom, which has electrons. [2 marks]
What is q3?Show answer
Explain why two isotopes of the same element have identical chemical reactions. [2 marks]
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