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Grade 8 Ch 3

Vocabulary from Ch 3 Building Blocks book

Mendeleev organized the first periodic table
atomic mass the average mass of one atom of the element
periodic table a table of elements arranged in a regular, repeating pattern
nucleus the core of the atom
proton a subatomic particle with a + charge
neutron a subatomic particle with no charge
electron a subatomic particle with a - charge
atomic mass unit (amu) the mass of a proton or neutron
atomic number the number of protons in an atom's nucleus
chemical symbol a shortened form for an element
group the elements in a column on the periodic table
family another name for group
period a row on the periodic table
valence electrons electrons located in the outer most shell that are involved in forming chemical bonds
malleable material that can be pounded into shapes
ductile material that can be pulled out, or drawn, into a long wire
conductor materials that can transmit heat and electricity
reactivity the ease or speed that an element combines or reacts with other elements or compounds
corrosion the process in which metal react with oxygen to form metal oxides
alloy a mixture of metals
diatomic molecules nonmetals that form molecules of two identical atoms
semiconductors substances that can carry electricity under some conditions, and under other conditions, cannot
plasma a state of matter in which atoms are stripped of their electrons and the nuclei are packed closely together
nuclear fusion atomic nuclei combine to form a larger nucleus, releasing huge amounts of energy
supernova a tremendous explosion that breaks apart a massive star producing high temperatures
Created by: Dcoleman



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