Atomic Structure Flashcards
(14 cards)
What is a compound
What is a mixture
Why and how do methods and theories develop over time?
Describe why the new evidence from the scattering experiment led to a change in the atomic model?
Describe the difference between the plum pudding model and the nuclear model
Use the nuclear model to describe atoms
Radius of an atom
Around 1x10^-10
Radius of a nucleus of an atom
Around 1x10^-14
explain how the position of an element in the periodic table is
related to the arrangement of electrons in its atoms and hence
Explain how testing a prediction can support or refute a new scientific idea
describe the steps in the development of the periodic table.
-Before the discovery of protons, neutrons and electrons, scientists
attempted to classify the elements by arranging them in order of their atomic weights.
-The early periodic tables were incomplete and some elements were
placed in inappropriate groups if the strict order of atomic weights was followed.
-Mendeleev overcame some of the problems by leaving gaps for elements that he thought had not been discovered and in some places changed the order based on atomic weights.
-Elements with properties predicted by Mendeleev were discovered and filled the gaps.
-Knowledge of isotopes made it possible to explain why the order based on atomic weights was not always correct.
• explain the differences between metals and non-metals on the
basis of their characteristic physical and chemical properties.
This links to Group 0 (page 24), Group 1 (page 24), Group 7 (page 25) and Bonding, structure and the properties of matter (page 26)
• explain how the atomic structure of metals and non-metals relates to their position in the periodic table
• explain how the reactions of elements are related to the arrangement of electrons in their atoms and hence to their atomic number.
