AnswersTN-Physical Science SC 26-27 For CreditAtomic Theory

Atomic Theory — Unit test Answers

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1
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Which statement best describes how electrons fill orbitals in the periodic table?

A
Electrons fill orbitals in order of their increasing energy from left to right.
B
Electrons fill orbitals in order of their increasing energy from right to left.
C
Elements fill orbitals in order of increasing energy from top to bottom in each group.
D
Elements fill orbitals in order of increasing energy from bottom to top in each group.
2
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Jerome is learning how the model of the atom has changed over time as new evidence was gathered. He has images of four models of the atom, but they are not in the correct order.In what order should Jerome put these models to show the development from the earliest model of the atom to the most recent one?

Question illustration
A
Y, X, Z, W
B
Y, Z, W, X
C
W, Z, X, Y
D
W, Y, Z, X
3

Which statement describes a property of a proton?

A
is found outside the nucleus
B
has a positive charge
C
has less mass than an electron
D
is repelled by electrons
4

The first model of the atom was developed through

A
scientific experimentation and data analysis with water vapor and gases.
B
observation of the light emitted by elements when they are heated.
C
thinking about the smallest particles of matter without experimenting.
D
analyzing the effects of a magnet on the path of a cathode ray.
5

The elements in group 17 of the periodic table are all called halogens. All halogens have the same

A
atomic number.
B
atomic mass.
C
number of possible isotopes.
D
number of valence electrons.
6

Which argument best explains the charge of an atomic nucleus?

A
An atomic nucleus is positively charged because it is composed of neutrons.
B
An atomic nucleus is positively charged because it is composed of protons.
C
An atomic nucleus is negatively charged because it is composed of electrons.
D
An atomic nucleus is negatively charged because it is composed of neutrons.
7

In which orbitals would the valence electrons for selenium (Se) be placed?

A
s orbital and f orbital
B
s orbital only
C
s orbital and p orbital
D
d orbital only
8

Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?

A
Johann Wolfgang Döbereiner
B
Antoine Lavoisier
C
Dmitri Mendeleev
D
Henry Moseley
9

When an atom that has no charge loses two electrons, it becomes a

A
positive ion.
B
negative ion.
C
positive isotope.
D
negative isotope.
10

Scientists in a lab are working with two different samples of the element mercury. They know that the different samples are different isotopes.

A
the atomic number
B
the electric charge
C
the element name
D
the mass number
11

What did Rutherford’s model of the atom include that Thomson’s model did not have?

A
a nucleus
B
energy levels
C
electron clouds
D
smaller particles
12

While looking at xenon (Xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group. Where should the student look?

A
directly up
B
directly down
C
directly to the left
D
directly to the right
13

What are the two parts of an atom?

A
the nucleus and the proton cloud
B
the neutron and the electron cloud
C
the neutron and the proton cloud
D
the nucleus and the electron cloud
14

This is how sodium appears in the periodic table.

Question illustration
A
number of neutrons.
B
chemical symbol
C
atomic mass
D
combined number of electrons and protons.
15

Who described atoms as small spheres that could not be divided into anything smaller?

A
Bohr
B
Dalton
C
Rutherford
D
Thomson
16

A blue circle labeled proton and A overlaps a pink circle labeled electron and C. The overlap is labeled B.

Question illustration
A
Is found in the nucleus
B
Has mass of 1 amu
C
Orbits the nucleus
D
Is electrically charged
17

An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?

A
30
B
35
C
65
D
95
18

Which of the following symbols would be included in the noble gas notation for an element that had valence electrons in the 5s subshell?

A
Ar
B
Kr
C
Xe
D
Rn
19

Atom A and Atom B have the same number of protons, but they do not have the same number of neutrons.Which statement describes these atoms?

A
Atom A and Atom B are isotopes of the same element.
B
Atom A and Atom B are different elements.
C
Atom A and Atom B have different atomic numbers.
D
Atom A and Atom B have the same mass number.
20

How many valence electrons does aluminum (Al) have available for bonding?

A
1
B
2
C
3
D
4

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