chem test
what groups are non- metals typically found in
13-17 18
defone metalloids
elements which posses the properties of both metal and non-metals
what doe sthe atomic number represent
the number of protons in an atom
which family of elements has two electrons in its valence shell
alkaline earth metals
how is the periodic table organized
by increasing atomic number, which is the number of protons in the atoms nucleus
what is an electron
subatomic oarticles negative in charge found hovering outside the nucleus
where are metals om the periodic table
to the left of the staircase
horizontal rows are called what (horizon think a sentance left to right)
period
list three properties of metals
conduct heat
shiny
ductile
definition of matter
anything that has mass or takes up space
what is special about the nobel gases
all gases at room temperature
thsir valence shell is full
whats atomic mass
number of protons and neutrons added together
list where uku find electrons, protons, and neutrons in an atom and their charges
proton- positive in nucleaus
electron- negative on outer shells
neutron- neutral in nucleus
what is an element
a pure substance that cant be broken down
what is in hofbrincl
hyrogen
oxygen
flurine
bromine
iodine
nitrogen
chlorine
whats an ion
a electrically charged atom
in an ionic compound which atom loses its electron
metal
what is a stock system
used fir the names of polyvalent elements
whats a polyvalent metal
metal with more than one oxidaton number (ionic charge)
what are diatomic molecules
non-metals that exist only as covalent bonded molecules
hofbrincl
covalent bond
made of non metals only
do NOT involve ions