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Edexcel Combined Science (chemistry) > 1.2 Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells > Flashcards

1.2 Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells Flashcards

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Edexcel Combined Science (chemistry) (23 decks)

Topic 1 - Key Concepts in Chemistry

1.1 Describe how the Dalton model of an atom has changed over time because of the discovery of subatomic particles

1.2 Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells

1.3 Recall the relative charge and relative mass of protons, neutrons And Electrons

1.4 Explain why atoms contain equal number of protons and electrons

1.5 Describe the nucleus of an atom as a very small compared to the overall size of the atom

1.6 Recall that most of the mass of an atom is concentrated in the nucleus

1.7 Recall the meaning of the term mass number of an atom • Mass (nucleon) Number = number of protons + neutrons

1.8 Describe atoms of a given element as having the same number of protons in the nucleus and that this number is unique to that element

1.9 Describe isotopes as different atoms of the same element containing the same number of protons but different numbers of neutrons in their nuclei

1.10 Calculate the numbers of protons, neutrons and electrons in Atoms Given The Atomic Number And Mass Number

1.11 Explain how the existence of isotopes results in relative atomic masses of some elements not being whole numbers

1.12 (higher tier) Calculate the relative atomic mass of an element from the relative masses and abundances of its isotopes

1.13 Describe how Mendeleev arranged the elements, known at that time, in a periodic table by using properties of these elements and their compounds

1.14 Describe how Mendeleev used his table to predict the existence and properties of some elements not then discovered

1.15 Explain that Mendeleev thought he had arranged elements in order of increasing relative atomic mass

1.16 Explain the meaning of atomic number of an element in terms of position in the periodic table and number of protons in the nucleus

1.17 Describe that in the periodic table: a) elements are arranged in order of increasing atomic number, in rows called periods and elements,

b) elements with similar properties are placed in the same vertical columns called groups

1.19 Predict the electronic configurations of the first 20 elements

1.21 Explain how ionic bonds are formed by the transfer of electrons between atoms to produce cations and anions, including the use of dot and cross diagrams

1.22 Recall that an ion is an atom or group of atoms with a positive or negative charge

1.23 Calculate the numbers of protons, neutrons and electrons in simple ions given the atomic number and mass number

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