Atoms
What are the 3 subatomic particles?
Protons, Neutrons and Electrons
what is the smallest part of an element called?
atom
what is in the nucleus of the atom?
protons and neutrons
what is the chemical symbol for potassium?
K
name an element on the periodic table
helium, hydrogen, etc
what charge do protons have?
positive
what charge do electrons have?
negative
what charge do neutrons have?
neutral
what is the chemical symbol for sodium?
Na
what are the 2 categories in the periodic table?
metals and non-metals
where are the electrons in the atom?
orbiting the nucleus in the shells
how many electrons can be held on every shell except the first one?
8
how many electrons can be held on the first shell?
2
what are the rows in the periodic table called?
periods
what are the columns in the periodic table called?
groups
what does the atomic number tell you?
how many protons in the atom of the element
what does the mass number tell you?
how many protons and neutrons in the atom of the element
what substance is malleable, ductile, strong and has a high melting point?
metals
what is group 2 called in the periodic table?
alkaline earth metals
what is group 1 called in the periodic table?
alkali metals
how do you figure out how many neutrons in the atom of an element?
mass number-atomic number
how do you figure out how many electrons are in an atom of the element?
atomic number as protons and electrons are the same
what is rusting an example of ?
corrosion
what is group 8 in the periodic table called?
noble gases
what is group 7 in the periodic table called?
halogens