Structure of the Atom
Chemistry ⇒ Atomic Structure and the Periodic Table
Structure of the Atom starts at 7 and continues till grade 12.
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Define the term 'isotope'.
Describe the main difference between the Bohr model and the quantum mechanical model of the atom.
Explain why atoms are electrically neutral.
State the charge and location of a proton in an atom.
State the main postulate of Bohr’s model of the atom regarding electron orbits.
The relative atomic mass of chlorine is 35.5. Explain why it is not a whole number.
Which scientist discovered the electron?
Which scientist is credited with the discovery of the neutron?
Which of the following best describes the charge and mass of a neutron?
(1) Positive charge, mass 1 amu
(2) No charge, mass 1 amu
(3) Negative charge, mass 0 amu
(4) No charge, mass 0 amu
Which of the following is NOT a feature of Dalton’s atomic theory?
(1) Atoms are indivisible.
(2) Atoms of the same element are identical.
(3) Atoms can be created or destroyed in chemical reactions.
(4) Atoms combine in simple whole-number ratios.
Which of the following is the correct symbol for an atom with 6 protons, 6 neutrons, and 6 electrons?
(1) 126C
(2) 612C
(3) 66C
(4) 126O
Which of the following statements about atomic structure is correct?
(1) Protons and neutrons are found outside the nucleus.
(2) Electrons are found in fixed orbits around the nucleus.
(3) The nucleus is negatively charged.
(4) Electrons have the same mass as protons.
Fill in the blank: The ______ is the region around the nucleus where the probability of finding an electron is highest.
Fill in the blank: The ______ model of the atom was the first to introduce the concept of a central nucleus.
The atomic number of an element is determined by the number of ______ in its nucleus.
The mass number of an atom is equal to the sum of the number of ______ and ______.
State whether the following statement is true or false: The number of electrons in a neutral atom is equal to the number of protons.
True or False: Isotopes of an element have the same number of protons but different numbers of neutrons.
True or False: The mass of an electron is approximately 1/1836 that of a proton.
True or False: The nucleus of an atom contains both protons and electrons.
