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Using the Periodic Table of
May 24, 2017
Terms to Know
Atomic number - the number of protons in an
atom's nucleus. It also tells you how many
electrons there are.
Example: Carbon has an atomic number of 6; how
many protons does carbon have? Electrons?
Mass number (Atomic Weight) - the number of
protons and neutrons in an atom's nucleus.
This number is usually larger than the atomic
Example: Carbon has 6 neutrons and 6 protons. What
is the mass number?
Finding the number of neutrons
Number of neutrons =
mass number (atomic weight) - atomic number.
Find the number of neutrons in Nitrogen.
Terms to Know
 Isotopes – are different forms of the
same element. They only differ in the
number of neutrons in the atom's
nucleus. The number of protons ALWAYS
remains the same.
 Radioactivity
– in some instances the
nucleus of an atom becomes unstable and
emits radiation.
Carbon Isotope
Periodic Table
The groups, moving from left to right, are
, metalloids
, and non-metals.
 Most of the elements in the periodic table
are metals .
Groups of the Periodic Table
Metal group – These elements have one, two, or
three electrons in the outermost energy level
and share electrons more easily than other
elements. Examples include Co, Cu, Au, Fe, Pb,
and Sn.
Nonmetal group – These elements have four
five, six, and seven electrons in the outermost
energy level and do not lose or share electrons
easily. Examples include C, N, and O.
Metalloid group – This group has properties of
include B, As, and Si.