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#atoms
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1
Consider a wooden chair and a balloon. What do these two objects always have in common?
Bothare made of the same number of atoms.
Bothare made of atoms.
Bothhave the same mass number.
Bothare made of the same kind of atom.
2
What is the atomic number of this atom?
7
6
3
4
3
What is the smallest particle of the element calcium that has the same properties of calcium?
aproton from a calcium atom
amolecule that contains calcium
anelectron from a calcium atom
anatom of calcium
4
basic building blocks for all types of matter
compound
proton
atom
element
5
atomic particle that has no charge
neutron
electron
proton
6
has the same properties as the elements or compounds that it is made of
compound
mixture
7
Which label points to the nucleus?
B
C
A
D
8
What can George conclude from his table?
Living things are made of only carbon, hydrogen, and oxygen
an infinite number of elements are needed to make the earth
Many different compounds can be made of the same elements
the 2 compounds are not composed of similar substances
9
An aluminum atom has 13 protons. What if a proton were added to an aluminum atom?
The atom would have a smaller atomic number.
The atom would no longer by aluminum.
The atom would have a negative charge.
The atom would lose electrons.
10
Elements are organized on the periodic table according to increasing __________________.
mass number
atomic number
weight
11
Mike is drawing a model of an atom. Where will he draw the nucleus of the atom?
onthe outer edge of the electron cloud
betweenthe center of the atom and the electron cloud
amongthe electrons in the electron cloud
inthe center of the atom, surrounded by the electron cloud
12
Why are helium and krypton found in the same group in the periodic table?
they have the same mass number
they share no common properties
they are both non-reactive gases
they are both solids
13
smallest unit of an element that maintains the properties of the element
molecule
atom
compound
proton
14
Which of these substances is NOT made out of atoms?
oxygen
protons
carbon dioxide
trees
15
How many atoms of oxygen are in every molecule of water (H
2
O)?
2
1
0
3
16
What do elements in the same group on the periodic table have in common?
same mass number
similar chemical symbols
same atomic number
similar chemical properties
17
Jorge is drawing an atomic model. What does he need to add to the drawing below?
protons
neutrons
a nucleus
an electron cloud
18
atomic particle that has a negative charge
neutron
proton
electron
19
found in the nucleus
protons and neutrons
protons and electrons
protons only
neutrons and electrons
20
What is the mass number of this atom?
6
4
3
7
21
positively charged atomic particle
proton
electron
neutron
22
material made up of 2 or more types of atoms chemically combined
atom
element
compound
mixture
23
least massive atomic particle
electron
neutron
proton
24
mass number
protons + neutrons + electrons
protons + neutrons
protons + electrons
neutrons + electrons
25
Which of these statements describes a fact about an atom’s nucleus?
It is the same size in all atoms.
It is smaller than an electron.
It is made of neutrons and protons.
It is negatively charged.
26
Rob wants to model an atom. If he uses a basketball for a proton, which would show an electron?
a beach ball
a soccer ball
a bowling ball
a pea
27
How many electrons does a neutral atom of oxygen have?
8
7.999
0
15.999
28
How do theories, such as the atomic theory, change?
opinions change
new evidence is discovered
theories never change
29
Sulfur(S) is in a column next to fluorine(F). Why are sulfur and fluorine in different columns?
different sizes
different atomic numbers
different properties
different atomic masses
30
A row of 100 million atoms would be only about 1 cm long. What occupies most of this space?
electrons
water
nuclei
empty space
31
A molecule of CO is made up of 1 carbon and 1 oxygen. Which describes the properties of CO?
properties are different from carbon and oxygen
same properties as all compounds of carbon and oxygen
1/2 the properties of carbon & 1/2 the properties of oxygen
mostly the properties of oxygen and few properties of carbon
32
What subatomic particle is lacking in hydrogen that is found in atoms of other elements?
a proton
an electron
a nucleus
a neutron
33
Which of the following statements follows the current understanding of atoms?
All atoms are the same.
Atoms cannot be divided into smaller parts.
Atoms are the smallest unit of an element.
There is an infinite number of kinds of atoms.
34
a material made up of only one type of atom
mixture
compound
electron
element
35
the number of protons in the nucleus
atomic number
mass number
36
Which things at the playground are made up of atoms of elements?
the trees and the grass
A. theswing set, slide, and seesaw
the air and the rock
everything
37
has properties that are different from the elements that it is made of
mixture
compound
38
How many protons does oxygen have?
15.999
8
0
7.999
39
Carbon has an atomic number of 6. What does this tell you about carbon?
theaverage atomic mass of a carbon atom
theperiod number of carbon
thegroup number of carbon
thenumber of protons in a carbon atom
