WAEC (WASSCE) Chemistry · Matter, atoms and chemical combination
Structure of the atom: WAEC Chemistry Past Questions and Answers
What the WAEC syllabus covers in Structure of the atom
Our summary: What atoms are made of, how the atomic models developed, and how electrons are arranged in shells and orbitals.
- Gross features of the atom ((1) Short account of Dalton's atomic theory and limitations, J.J. Thomson's experiment and Bohr's model of the atom. (2) Outline description of the Rutherford's alpha scattering experiment to establish the structure of the atom.)
- Atomic number/proton number, number of neutrons, isotopes, atomic mass, mass number (Meaning and representation in symbols of atoms and sub-atomic particles.)
- Relative atomic mass (Ar) and relative molecular mass (Mr) based on Carbon-12 scale ((1) Atomic mass as the weighted average mass of isotopes. Calculation of relative mass of chlorine should be used as an example. (2) Carbon-12 scale as a unit of measurement. Definition of atomic mass unit.)
- Characteristics and nature of matter (Atoms, molecules and ions. Definition of particles and treatment of particles as building blocks of matter.)
- Particulate nature of matter: physical and chemical changes (Explain physical and chemical changes with examples. Physical change - melting of solids, magnetization of iron, dissolution of salt etc. Chemical change - burning of wood, rusting of iron, decay of leaves etc.)
- Electron configuration (Detailed electron configurations (s, p, d) for atoms of the first thirty elements.)
- Orbitals (Origin of s, p and d orbitals as sub-energy levels; shapes of s and p orbitals only.)
- Rules and principles for filling in electrons ((1) Aufbau Principle, Hund's Rule of Maximum Multiplicity and Pauli Exclusion Principle. (2) Abbreviated and detailed electron configuration in terms of s, p, and d.)
Syllabus content © The West African Examinations Council (WASSCE (harmonised West African syllabus)).
WAEC (WASSCE) Chemistry questions on Structure of the atom
- WAEC 2024Isotopes of the same element have similar chemical properties because they have the same number of
- WAEC 20248 X ^ 2- and 10 Y are
- WAEC 2024An atom of an element in the ground state contains 8 valence electrons. The element is considered as a
- WAEC 2024The electron configuration of 29 Cu is
- WAEC 2024The electron configuration 1S ^2 2S ^2 2P x ^2 contravenes the
- WAEC 2024Naturally occurring Boron is made up of 19.9% ^ 10 B and 80.1% ^ 11 B. The relative atomic mass of Boron is
- WAEC 2023Which of the following elements has its valence electrons in the s-orbital?
- WAEC 2023How many unpaired electrons are present in 26 Fe^ 3+ ?
- WAEC 2023Isoelectronic species have the same number of
- WAEC 2023An element X has two isotopes, ^ 65 X 30 and ^ 66 X 30 with relative abundance of 60 % and 40% respectively. The relative atomic mass of X is
- WAEC 2022The atom with the electron configuration 1s ^ 2 2s ^ 2 2p63s ^ 2 3p ^ 6 3d ^ 10 4s ^ 2 4p ^ 4 is in
- WAEC 2022The first definition of an element was made by
- WAEC 2022The electron configuration of carbon atom in its excited state is
- WAEC 2021The region around the nucleus where electrons can be located is called?
- WAEC 2021An element, Q, contains 69% of ^ 63 Q and 31% of ^ 65 Q. What is the relative atomic mass of Q?
- WAEC 2021The isotopes of neon are represented by the symbols ^ 20 x Ne, ^ 21 y Ne, and ^ 22 z Ne. The relationship between x, y, and z is?
- WAEC 2021The following ions have the same electron configuration except 8 O, 12 Mg, 13 AI, 17 CI
- WAEC 2021The Bohr model of the atom proposed the existence of?
- WAEC 2021Protons and electrons are called fundamental particles because they----------
- WAEC 2021Which of the following scientists discovered the electrons?
- WAEC 2020"Electrons always occupy the lowest empty energy level" is a statement of
- WAEC 2020How many electrons does 31 15 P ^3- contain?
- WAEC 2020The atomic number of an atom would be equal to its mass number if it
- WAEC 2019The atoms of ^ 64 29 Cu and ^ 65 30 Zn have the same number of?
- WAEC 2019One of the deductions from Rutherford's alpha particle scattering experiment is that?
- WAEC 2019The number of electrons in the 3d orbital of 24 Cr is
- WAEC 2018Which of the following electron configurations represents the transition element Chromium 24 Cr ?
- WAEC 2018The valence electrons of 12 Mg are in the
- WAEC 2018The atomic number of an isotope of hydrogen is equal to its mass number because it
- WAEC 2018Atoms are electrically neutral because they
- WAEC 2017Pauli exclusion principle is related to
- WAEC 2017Atomic orbital is
- WAEC 2017Which of the following species determines the chemical properties of an atom?
- WAEC 2017The species with no electron in the 3d-orbital is
- WAEC 2016An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?
- WAEC 2016The following atoms of carbon 126C, 136C and 146C can be described as?
- WAEC 2015A metallic ion Z ^ 2+ with an inert gas structure contains 18 electrons. How many protons are contained in this ion?
- WAEC 2015How many orbits are contained in an atom with atomic number 13?
- WAEC 2015The number of unpaired electrons in an atom of an element 8Q is … ?
- WAEC 2015The negatively charged particle in an atom is the
- WAEC 2014Which of the following processes is used in food preservation in an industry?
- WAEC 2014The relative atomic mass of chlorine is not a whole number because
- WAEC 2014The electron configuration of 26 Fe^ 3+ is?
- WAEC 2014An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?
- WAEC 2013Which of the following statements about nuclear reaction is correct? The reaction
- WAEC 2013Which of the following instruments is used in detecting the presence of radiation?
- WAEC 2013An atom of an element X gains two electrons. The symbol of the ion formed is
- WAEC 2013Which of the following arrangements represents the correct order of electronic energy level?
- WAEC 2013The element with electron configuration 1s ^2 2s ^2 2p ^6 3s ^2 3p ^1 belongs to
- WAEC 2013Which of the following elements is diatomic?
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