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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Describe the main postulates of Dalton’s atomic theory.
Explain the difference between atomic number and mass number.
Explain the Pauli Exclusion Principle.
Explain why isotopes of the same element have identical chemical properties.
How many unpaired electrons are present in a nitrogen atom (atomic number 7) in its ground state?
Calculate the number of protons, neutrons, and electrons in ²⁷Al³⁺ (atomic number 13).
The atomic number of an element is 15. Write its electronic configuration and state the number of valence electrons.
The isotope carbon-14 is used in radiocarbon dating. How many neutrons does it have? (Atomic number of carbon = 6)
Which experiment led to the discovery of the nucleus? (1) Gold foil experiment (2) Cathode ray experiment (3) Oil drop experiment (4) Photoelectric effect
Which of the following is a correct statement about the nucleus of an atom? (1) It contains most of the atom’s mass. (2) It contains electrons. (3) It is negatively charged. (4) It is much larger than the atom itself.
Which of the following is not a part of Dalton’s atomic theory? (1) Atoms are indivisible. (2) Atoms of different elements are different. (3) Atoms can be created or destroyed in chemical reactions. (4) Atoms combine in simple whole-number ratios.
Which of the following is not a quantum number? (1) Principal (n) (2) Azimuthal (l) (3) Magnetic (ml) (4) Atomic (a)
Isotopes of an element have the same number of protons but different number of ______.
The atomic mass of an element is not a whole number because ______.
The atomic number of an element is equal to the number of ______ in its atom.
The maximum number of electrons that can be accommodated in an s-orbital is ______.
State whether the following statement is true or false: All atoms of the same element have the same mass number.
State whether the following statement is true or false: The 2p orbital can hold a maximum of 6 electrons.
State whether the following statement is true or false: The 4s orbital is filled before the 3d orbital.
State whether the following statement is true or false: The mass of a proton is approximately equal to that of a neutron.
