1. Atomic structure
A section of Chemistry, 9701
Listing 10 of 359 questions
Atoms contain the subatomic particles electrons, protons and neutrons. Protons and electrons were discovered by observations of their behaviours in electric fields. The diagram shows the behaviour of separate beams of electrons and protons in an electric field. source charge on plate charge on plate electrons protons Complete the diagram with the relative charge of each of the electrically charged plates.  On the diagram, draw a line to show how a separate beam of neutrons from the same source behaves in the same electric field. Electrons in atoms up to 36Kr are distributed in s, p and d orbitals. State the number of occupied orbitals in an isolated atom of 36Kr. type of orbital s p d number of orbitals  Complete the diagram to show the number and relative energies of the electrons in an isolated atom of 14Si. 4s 3p 3s 2p 2s 1s  The diagram shows a type of orbital. State the total number of electrons that exist in all orbitals of this type in an atom of 9F. The first ionisation energies of elements in the first row of the d block (21Sc to 29Cu) are very similar. For all these elements, it is a 4s electron that is lost during the first ionisation. Suggest why the first ionisation energies of these elements are very similar. Hydron is a general term used to represent the ions 1H+ , 2H+ and 3H+ . State, in terms of subatomic particles in the nucleus, what is the same about each of these ions and what is different. same different  
9701_w20_qp_22
THEORY
2020
Paper 2, Variant 2
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When nuclear reactions take place, the elements produced are different from the elements that reacted. Nuclear equations, such as the one below, are used to represent the changes that occur. U + n 0 → Ba + Kr + 3 n The nucleon number total is constant at 236 and the proton number total is constant at 92. In another nuclear reaction, uranium-238 is reacted with deuterium atoms, H. An isotope of a new element, J, is formed as well as two neutrons. U + H → J + 2 n What is isotope J?
9701_s16_qp_11
MCQ
2016
Paper 1, Variant 1
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Questions Discovered
359