KEY - NOM Chapter 1 Review
Using Vocabulary – page 35
1.) The proton is the particle in the nucleus of an atom that carries a positive
charge and is counted to identify the atomic number.
2.) The new substance formed when elements combine chemically is a
compound.
3.) The atomic number is equal to the number of protons in an atom.
4.) The particles in the atom that account for most of the mass of the atom
are protons and neutrons.
5.) Elements that are shiny, malleable, ductile, good conductors of heat and
electricity, and make up most of the periodic table are metals.
Checking Concepts – page 36
1.) A solution an example of …
D – homogeneous mixture
2.) The nucleus of one atom contains 12 protons and 12 neutrons, while the
nucleus of another atom contains 12 protons and 16 neutrons. What are
these atoms?
C – isotopes of Magnesium
3.) What is a compound? B – 2 or more elements that have chemically
combined
4.) What doe the atom consist of?
C – electrons, protons & neutrons
5.) In an atom the electron is located… D – in a cloudlike formation
surrounding the nucleus.
6.) Mass number is… B – the number of protons and neutrons in an atom
7.) Two atoms that have the same number of protons are … C – isotopes
8.) The majority of elements on the periodic table are called… A – metals
9.) The element that is a metalloid is… B – silicon
10.)
An example of a heterogeneous mixture is…
C – salad
Thinking Critically – pages 36 & 37
11.)
12.)
13.)
The ratio of sulfur atoms to oxygen atoms in SO2 is 1:2.
The element that contains 7 electrons and 7 protons would be
Nitrogen because the number of protons determines the identity of
an atom and nitrogen’s atomic number is 7.
When an element forms a compound, it loses its characteristics
(properties), and a new substance is formed.
KEY - NOM Chapter 1 Review
14.)
15.)
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19.)
Cobalt – 60 and cobalt – 59 are isotopes. They are the same
element because they have the same atomic number, and they
have different mass numbers because they have a different
number of neutrons.
Rutherford’s gold foil experiment told scientists that the atom
contains a small, dense, positively charged structure that Rutherford
called a nucleus.
If Rutherford had used aluminum foil instead of gold for his
experiment, he would have had the same results, because his
conclusions about a dense nucleus surrounded by almost empty
space were true for all types of atoms.
Although aluminum is close to carbon on the periodic table, but
aluminum is classified as metal because it is a shiny (metallic luster),
solid that can be pounded into different shapes without breaking
and is a good conductor of heat. Carbon is dull in appearance, it is
not malleable or ductile, nor is it a good conductor of heat &
electricity.
This liquid must be a homogeneous mixture because although it
looks the same throughout, the proportions/ratios of the substances
that make it up vary. It can’t be an element because there’s more
than one type of matter. It can’t be a compound because the
ratios/proportions of the substances that make up a compound
don’t change.
The atoms are isotopes because they have the same number of
protons but a different number of neutrons.