periodic table
horizontal row
period
group 1, period 3
sodium
hydrogen
gas
positively charge particle in the nucleus
proton
organized list of elements arranged by atomic number
periodic table
vertical column
group
carbon's group number
14
carbon
solid
negatively charged particle surrounding the nucleus
electron
positively charged center of the atom
nucleus
The number of protons
atomic number
oxygen's period number
2
mercury
liquid
neutral particle in the nucleus
neutron
atoms of the same element with a different number of neutrons
isotope
number of protons + number of neutrons
mass number
group and period number of Xe
group 18, period 5
neon
gas
the area surrounding the nucleus
electron cloud
the symbol for an element surrounded by the number of electrons in the outer energy level
electron dot diagram
the weighted numerical average of all naturally occurring isotopes
average atomic mass
period 3, group 8
doesn't exist
dry ice
solid
particles that make up protons and neutrons, also a type of cheese
quark
radioactive element used in nuclear reactors and nuclear bombs
uranium or plutonium