Atoms
A positively charged subatomic particle
proton
electrons
groups
Elements from group 1 form what kind of ions?
+1, cation (lose one electron)
elements that have properties of both metals and nonmetals
semiconductors or metalloids
A subatomic particle without charge that contributes to the mass of the atom.
Which two subatomic particles make up the nucleus?
protons and neutrons
What are rows on the periodic table called?
periods
Elements in the same group have the same number of what?
valence electrons
reactive elements of group 17 that are poor conductors
halogens
valence electrons
All atoms want ______ valence electrons.
8
Elements on the periodic table are arranged by what?
atomic number
How do you know that potassium (K) is highly reactive?
it only has 1 valence electron
alkali metals
The number of protons in an atom is equal to what?
atomic number
Neutral atoms contain the same number of what?
protons and electrons
When Mendeleev created the first periodic table, what did he arrange the elements by?
atomic mass
Elements from group 17 form what kind of ions?
Elements that belong to groups 3-12 and are somewhat reactive
transition metals
Atoms with the same number of protons but with a positive or negative charge.
ions
Atoms with the same number of protons, but with different neutrons.
isotopes
How many valence electrons does group 13 have?
3
What is ionization?
losing or gaining electrons
Group 2 elements that have two valence electrons
alkaline-earth metals