Which of the following is true of Period 3 elements as one goes left to right across the table?

Radius gets smaller and # of energy levels stays same.

What did the Gold Foil experiment conclude about the structure of the atom?

Most of the atom is empty space.

gain electrons and become negative

Identify the models in the picture.

The top model is Thompson & the bottom is Rutherford

neutral and the # of protons equals the # of electrons

lose electrons and become positive ions

What was not correct in Dalton's Atomic Theory?

Atoms of the same element are not always identical.

What was not correct in Dalton's Atomic Theory?

Atoms can be subdivided into subatomic particles.

What causes the color of the flames?

Electrons returning to the ground state

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Atomic Structure and Periodic Table

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Exam review for foundations in chemistry class

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Questions 24

Answers

1
A cation is a(n)
isotope of an atom
negative ion
positive ion
neutral ion
2
What element could this be?
manganese
chlorine
sodium
argon
3
Identify two atoms most similar to sodium.
Ne and Be
K and Rb
H and Mg
Mg and Ca
4
What part of the atom is responsible for reactivity of atoms?
protons
valence electrons
nucleus
inner shell electrons
5
Which element has the largest atomic radius?
Rb
K
Li
Na
6
Which two subatomic particles make up most of the mass of an atom?
electrons and protons
beta particles and electrons
electrons and neutrons
neutrons and protons
7
Which of the following is true of Period 3 elements as one goes left to right across the table?
Radius gets smaller and # of energy levels stays same.
Radius gets larger and # of energy levels increases
Radius gets smaller and # of energy levels decreases.
Radius gets smaller and # of energy levels increases
8
What did the Gold Foil experiment conclude about the structure of the atom?
Electrons are in the nucleus.
The nucleus is negative.
Most of the atom is empty space.
Most of the nucleus is empty space.
9
Whose model is called the Solid Sphere Model?
Bohr
Rutherford
Dalton
Thomson
10
Identify the element with 5 valence electrons and 4 energy levels.
Ge
V
As
Sb
11
Which element is the most nonmetallic?
Fr
He
F
H
12
Nonmetals tend to
lose electrons and become negative
lose electrons and become positive
gain electrons and become positive
gain electrons and become negative
13
What is the atomic number of bromine-80?
5
35
45
80
14
Which of the following is an isotope of carbon-14?
6 protons, 8 neutrons
8 protons, 6 neutrons
14 protons, 6 neutrons
6 protons, 6 neutrons
15
Identify the models in the picture.
The top model is Dalton & the bottom is Rutherford
The top model is Thompson & the bottom is Rutherford
The top model is Rutherford & the bottom is Thompson
The top model is Rutherford & the bottom is Dalton
16
Atoms are
neutral because the # of protons equals the # of neutrons
neutral because the # of neutrons equals the # of electrons
neutral and the # of protons equals the # of electrons
positive because there are more protons than electrons
17
Metals tend to
gain electrons and become positive ions
lose electrons and become negative ions
gain electrons and become negative ions
lose electrons and become positive ions
18
Which atom has 20 protons, 20 electrons, 22 neutrons?
neon-20
calcium-40
calcium-42
neon-22
19
What was not correct in Dalton's Atomic Theory?
Atoms do not exist.
Atoms do not form compounds in a definite ratio.
Atoms of the same element are not always identical.
Atoms do not combine in chemical reactions.
20
Which element in in group 13 period 2?
Be
B
Mg
Al
21
What was not correct in Dalton's Atomic Theory?
Atoms of the same element are always identical.
Atoms can be subdivided into subatomic particles.
Atoms do not form compounds in a definite ratio.
Atoms do not combine in chemical reactions.
22
Who discovered electrons?
Rutherford
Dalton
Thomson
Bohr
23
What causes the color of the flames?
Electrons returning to the ground state
Protons returning to the ground state
Electrons jumping to higher energy levels and staying there
Protons jumping to higher energy levels
24
How many valence electrons are in an atom with the electron configuration of 2-8-3?
8
2
13
3

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