Science Test this Friday, December 2nd
We have started studying for our test on Elements and the Periodic Table that is scheduled on Friday, December 2nd. Students should review these key concepts in preparation for the test. (Students have been given a study guide with these concepts.) Good luck, students!
- Atoms are made of even smaller particles called protons, neutrons, and electrons.
- An element can be identified by the number of protons in the nucleus of its atoms.
- Because atoms are so small, scientists create models to describe them.
- Mendeleev noticed that a pattern of properties appeared when he arranged the elements in order of increasing atomic mass.
- Each square in the periodic table includes the element’s atomic number, chemical symbol, name, and atomic mass.
- The properties of an element can be predicted from its location in the periodic table.
- The physical properties of metals include shininess, malleability, ductility, and conductivity
- The reactivity of metals tends to decrease as you move from left to right across the periodic table.
- Elements that follow uranium in the periodic table are made—or synthesized—when nuclear particles are forced to crash into one another.
- Most nonmetals are poor conductors of heat and electricity and are reactive with other elements. Solid nonmetals are dull and brittle.
- The most useful property of the metalloids is their varying ability to conduct electricity.
