Atomic structure
Atoms are the smallest unit of matter, made up of
protons, neutrons, and electrons.
Atoms that have gained or lost electrons, making them charged.
Ions
Elements are arranged by
increasing atomic number
What includes elements and compounds?
Pure substances
Protons and neutrons are in the nucleus, while electrons...
Orbit the nucleus
Groups (columns) contain...
elements with similar properties
Mixtures can be...
Homogenus (uniform)
or
heterogenous (not uniform)
represents the number of protons in an atom
Atomic number
Periods (rows) show elements with the same...
number of energy levels.
homogeneous mixtures.
The sum of protons and neutrons.
mass number
Where are metals, nonmetals, and metalloids found
metals- left
nonmetals- right
metalloids- in between
Atoms of the same element with different numbers of neutrons.
Isotopes
Noble gases are nonreactive, while halogens and alkali metals are...
highly reactive