Question 1

Do the following represent elements in a group, a period, or neither?
-F, S, P

Accepted Answer

A)  period
B)  neither
C)  groupD) A) and B)
E) A) and C)

Question 2

The element in this list with chemical properties similar to magnesium is

Accepted Answer

A)   sodium.
B)   boron.
C)   carbon.
D)   strontium.
E)   chlorine.F) All of the above
G) B) and C)

Question 3

Classify the following elements.
-argon

Accepted Answer

A)  noble gas
B)  alkali metal
C)  nonmetal
D)  alkaline earth metal
E)  transition elementF) halogenG) C) and F)
H) D) and E) A

Question 4

The number of electrons in the outer energy level of a neutral atom of boron (atomic number 5)  is

Accepted Answer

A)   2.
B)   3.
C)   5.
D)   8.
E)   10.F) All of the above
G) C) and D)

Question 5

What is the mass number of an atom of potassium that has 20 neutrons?

Accepted Answer

A)   15
B)   19
C)   35
D)   39
E)   59F) All of the above
G) A) and B)

Question 6

The symbol for potassium is P.

Accepted Answer

A) True 
 B)False

Question 7

The correct symbol for the isotope of potassium with 22 neutrons is

Accepted Answer

A)   4119 K.
B)   1941 K.
C)   3715 P.
D)   1537 P.
E)   2219 K.F) A) and E)
G) A) and D)

Question 8

Classify the following elements.
-in the third energy level of sodium

Accepted Answer

A)  one
B)  seven
C)  two
D)  eight
E)  fiveF) A) and C)
G) A) and B)

Question 9

Identify the metalloid in the following list.

Accepted Answer

A)   sulfur
B)   fluorine
C)   silver
D)   copper
E)   germaniumF) A) and E)
G) A) and D)

Question 10

A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu)  makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu)  makes up 24.3% of the sample. What is the average atomic mass for chlorine?

Accepted Answer

A)   36.0 amu
B)   35 amu
C)   36.6 amu
D)   35.5 amu
E)   35.521 amuF) B) and D)
G) A) and B)

Question 11

Which element would have physical and chemical properties similar to chlorine?

Accepted Answer

A)   Ar
B)   Br
C)   S
D)   O
E)   PF) A) and B)
G) C) and D)

Question 12

Which of the following is NOT true for the atoms 13N, 14N, and 15N?

Accepted Answer

A)   They all have the same mass number.
B)   They are isotopes.
C)   They all have the same atomic number.
D)   They all have 7 protons.
E)   They all have 7 electrons.F) C) and D)
G) B) and C) A

Question 13

Write in the electronic configuration for the atom shown.
-Argon

Accepted Answer

The answer of Write in the electronic configuration for the...

Question 14

Iodine is a metal.

Accepted Answer

A) True 
 B)False

Question 15

Atomic size decreases going from left to right within a period.

Accepted Answer

A) True 
 B)False

Question 16

Match the correct symbols with the names of elements.
-calcium

Accepted Answer

A)  C
B)  Co
C)  Cu
D)  Cl
E)  CaF) B) and C)
G) None of the above

Question 17

What is the element with the abbreviated electron configuration [Kr]5s24d8?

Accepted Answer

A)   Ni
B)   Pd
C)   Pt
D)   Kr
E)   XeF) B) and C)
G) A) and D) B

Question 18

Select the correct symbol for the element
-iron

Accepted Answer

A)   Ir
B)   Fs
C)   Fe
D)   In
E)   FEF) A) and D)
G) B) and D)

Question 19

Valence electrons are electrons located

Accepted Answer

A)   in the outermost energy level of an atom.
B)   in the nucleus of an atom.
C)   in the innermost energy level of an atom.
D)   throughout the atom.
E)   in the first three shells of an atom.F) A) and D)
G) C) and D)

Question 20

The mass number of an atom can be calculated from

Accepted Answer

A)   the number of electrons.
B)   the number of protons plus neutrons.
C)   the number of protons.
D)   the number of electrons plus protons.
E)   the number of neutrons.F) C) and D)
G) B) and C)

Exam 3: Atoms and Elements

Do the following represent elements in a group, a period, or neither? -F, S, P

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The element in this list with chemical properties similar to magnesium is

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Classify the following elements. -argon

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The number of electrons in the outer energy level of a neutral atom of boron (atomic number 5) is

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What is the mass number of an atom of potassium that has 20 neutrons?

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The symbol for potassium is P.

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The correct symbol for the isotope of potassium with 22 neutrons is

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Classify the following elements. -in the third energy level of sodium

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Identify the metalloid in the following list.

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A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.3% of the sample. What is the average atomic mass for chlorine?

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Which element would have physical and chemical properties similar to chlorine?

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Which of the following is NOT true for the atoms 13N, 14N, and 15N?

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Write in the electronic configuration for the atom shown. -Argon

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Iodine is a metal.

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Atomic size decreases going from left to right within a period.

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Match the correct symbols with the names of elements. -calcium

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What is the element with the abbreviated electron configuration [Kr]5s24d8?

Correct AnswerverifiedB

Select the correct symbol for the element -iron

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Valence electrons are electrons located

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The mass number of an atom can be calculated from

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A

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Which of the following is NOT true for the atoms ¹³N, ¹⁴N, and ¹⁵N?

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A

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What is the element with the abbreviated electron configuration [Kr]5s²4d⁸?

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B

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