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Study Island
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Generation Date: 03/16/2015
Generated By: Kristina Brown
1. Atoms that have the same number of valence electrons in their outer shell
A. belong to the same family of elements.
B. must be atoms of the same element.
C. are all metallic elements.
D. are all nonmetallic elements.
2. A chemical reaction involves the rearrangement of atoms to form new molecules. During a
chemical reaction, however, atoms are neither created nor destroyed.
Which of the following is true about the atoms involved in a chemical reaction?
The total mass of the atoms involved in a chemical reaction always changes as the atoms
A. are rearranged into new molecules.
The total mass of the atoms involved in a chemical reaction will decrease if two molecules
B. combine to form one single compound.
The total mass of the atoms involved in a chemical reaction will increase if a new
C. compound is formed during the reaction.
The total mass of the atoms involved in a chemical reaction will stay the same no matter
D. how the atoms are rearranged.
3. Technology Enhanced Questions are not available in Word format.
4. Ryan wants to identify an element. Which piece of information would best help Ryan identify
the element?
A. how many protons the element has
B. what charge the element has
C. how many electrons the element has
D. how many neutrons the element has
5.
Along each row of the periodic table,
A. atomic mass is the same for all elements in the row.
B. atomic mass increases from left to right.
C. atomic mass changes in no set pattern.
D. atomic mass decreases from left to right.
6. All atoms of a specific element have the same number of _______.
A. electrons
B. neutrons
C. protons
D. ions
7. What is the smallest part of an element that still retains properties of that element?
A. compound
B. molecule
C. mixture
D. atom
8. An element has a very low boiling point and very low reactivity. Where on the periodic table
is this element most likely to be found?
A. in the bottom row
B. in the far right column
C. in the far left column
D. in the top row
9. Which of the following is a feature of the electron cloud model of an atom?
A. All atoms contain two electron shells.
B. Electrons travel unpredictably.
C. Electrons travel in specific orbits around the atom.
D. The first electron shell holds 8 electrons.
10. Scientists have discovered just over _____ different elements with unique properties.
A. 50
B. 200
C. 400
D. 100
Answers
1. A
2. D
3. -4. A
5. B
6. C
7. D
8. B
9. B
10. D
Explanations
1. Atoms that have the same number of valence electrons in their outer shell have similar
properties and belong to the same family of elements. Valence electrons are the outermost
electrons in the atom and are important in determining how the atom chemically reacts with
other atoms.
2. Matter is conserved during a chemical reaction, which means that the number of atoms
involved in the reaction will stay the same. Therefore, the total mass of the atoms involved in a
chemical reaction will stay the same no matter how the atoms are rearranged. As a result of
the conservation of matter during chemical reactions, most of the atoms that are present on Earth
today are the same atoms that were present when the Earth first formed.
3. -4. The atoms of each element differ from those of all other elements in the number of protons. If
Ryan found out how many protons the element had, he would be able to identify the element.
5. The elements on the periodic table are arranged in rows, or periods, by increasing atomic
mass. Along each row of the periodic table, atomic mass increases from left to right.
6. The number of protons in an atom gives the atom its identity. For example, all atoms with six
protons found in their nucleus are atoms of the element carbon.
7. All matter is made of tiny moving particles called atoms. An atom is the smallest part of an
element that still has all the properties of the element. Although the atoms of an individual
element are alike, they are different from atoms of other elements.
Atoms are so small that they cannot be directly seen with the naked eye or even with simple
microscopes.
8. Elements in the far right column of the periodic table are noble gases. Noble gases have very
low boiling points and very low reactivity.
An element with a very low boiling point and very low reactivity is most likely a noble gas,
which would place it in the far right column of the periodic table.
9. In the electron cloud model of an atom, electrons travel around the nucleus within regions of
probability known as electron clouds. Although the electron clouds do have predictable shapes,
electrons travel unpredictably within the clouds.
10. Up to today, scientists have discovered over 100 different elements with unique properties.
The current total is near 120.