2015 Unit test Flashcards
An elements one or two letter code representing its name
Chemical Symbol
this is found by adding the numbers of protons and neutrons
Atomic mass
The number of protons in an atom
atomic number
An atom that has gained or lost electrons and therefore is not neutrally charged
Ion
An atom that has a different number of neutrons than protons or electrons
Isotope
Unique pure substances that are made of atoms having the same properties and the same number of protons.
Elements
A chart that contains all the known elements arranged in order by their number of protons
Periodic table
The vertical columns on the periodic table are known as the
periods
The horizontal rows on the Periodic table are known as
groups
The group number indicate the number of ________ in the valance shells
electron
The period number tells you the number of ______ each elements in the column contains
electron shell
valence electrons are located where on the periodic table
on the top
The electron shells are located where on the periodic table
to the left
good conductors, can be flattened, also ductile and can bend, appear shiny and have few electrons on their outer shell
Metals
They are not ductile or malleable, the can be brittle, they are semi-conductors and they have an almost 1/2 full outer shell
Metalloids
