Download Section 1 Review

Name
----------------------------
CIlL<;S
----------- Date - - - - - - ­
Section 1 Review
SECTION VOCABULARY
atom the smallest unit of an element that main­
tains the chemical properties of that element
electron a subatomic particle that has a negative
charge
element a substance that cannot be separated
or broken down into simpler substances by
chemical means
isotope one of two or more atoms that have the
same number of protons (atomic number) but
different numbers of neutrons (atomic mass)
matter anything that has mass and takes up
space
neutron a subatomic particle that has no charge
and that is located in the nucleus of an atom
proton a subatomic particle that has a positive
charge and that is located in the nucleus of an
atom; the number of protons of the nucleus
is the atomic number, which determines the
identity of an element
1. Describe Complete the chart below to describe the properties of the subatomic
particles.
I Proton
i
!
Charge
I
Ioutside the nucleus
Location
I Neutron
J
I
I
in the nucleus
I
2. Compare What is the difference between a chemical property and a physical
property?
3. Apply Concepts An atom has 14 protons and 15 neutrons. What is its mass
number? What element is it an atom of? Explain your answer. You can use the
periodic table to help you answer.
4. Explain Why do isotopes of an element have the same atOInic number but
different mass numbers?
5. Infer Sodium and potassium are in the same group on the periodic table. Name
two other ways sodium and potassium are similar.
Copyright © Holt :VkDougai. All rights reserved.
Holt McDougal Earth Science
50
Earth Chemistry