Subatomic Particles
what is the smallest unit of an element called
atom
what is the name of group 1 elements
alkali metals
horizontal row
this elements symbol is Mg
magnesium
the size of the atom is referred to as
atomic radius
atomic number of tungsten
74
what do elements in a group have in common
valence electrons
how many periods are on the periodic table
7
This element’s symbol comes from the Latin word Ferrum.
iron
attraction for electrons
electronegativity
what does atomic number represent
protons
which group is the most reactive nonmetals
halogens (group 17)
what does period number represent
number of shells/energy levels
This element is named after the Greek word for “new.”
neon
the amount of energy needed to remove an electron
ionization energy
what does atomic mass represent
p + n
a group of nonactive monatomic gases
what period has the element with the highest electronegativity
period 2 (F)
This element’s name comes from the Greek word for “green twin” because of its resemblance to chlorine.
bromine
what is responsible for the atomic trends as you move down a group
increase in electron shells
this scientist's gold foil experiment revealed that atoms are mostly empty space with a dense, positively charged center.
ernest rutherford
name an element with similar chemical properties as Sr
Be, Mg, Ca, Ba, Ra
Why do elements in the same period have different chemical properties even though they share the same number of energy levels?
different valence electrons
This element is named after a dwarf planet.
Pu, Plutonium
Why does atomic radius decrease across a period even though electrons are added?
the increase in protons pulls the electrons closer