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 difference between the plum pudding model and the nuclear model of the atom.
Describe what is meant by the term 'isotope'.
Explain why atoms are electrically neutral.
Explain why isotopes of the same element have different mass numbers but the same atomic number.
An atom has 6 protons, 6 neutrons, and 6 electrons. What is its atomic number and mass number?
An atom of magnesium has 12 protons and 12 electrons. If it loses two electrons, what is the charge on the resulting ion?
An atom of sodium has 11 protons, 12 neutrons, and 11 electrons. What is its mass number?
Calculate the number of neutrons in an atom of phosphorus with mass number 31 and atomic number 15.
The relative charge of a proton is: (1) +1 (2) 0 (3) -1 (4) +2
Which model of the atom first introduced the idea of energy levels or shells for electrons? (1) Dalton’s model (2) Thomson’s model (3) Rutherford’s model (4) Bohr’s model
Which of the following elements has the electronic configuration 2,8,7? (1) Oxygen (2) Chlorine (3) Sodium (4) Nitrogen
Which of the following is NOT a part of Dalton’s atomic theory? (1) Atoms are indivisible. (2) All atoms of an element are identical. (3) Atoms can be created or destroyed in chemical reactions. (4) Atoms combine in simple whole-number ratios to form compounds.
Fill in the blank: The ______ is the region around the nucleus where electrons are most likely to be found.
Fill in the blank: The mass number of an atom is the sum of its ______ and ______.
The atomic number of an element is equal to the number of ______ in its atom.
The nucleus of an atom contains ______ and ______.
State whether the following statement is true or false: Electrons are found in the nucleus of an atom.
State whether the following statement is true or false: Isotopes of an element have the same chemical properties.
State whether the following statement is true or false: The nucleus of an atom is positively charged.
True or False: The mass of an electron is considered negligible compared to protons and neutrons.
