Question 1

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

Accepted Answer

A)  Ni 
B)  Pd 
C)  Pt 
D)  Kr 
E)  Xe 
A)  Ni 
B)  Pd 
C)  Pt 
D)  Kr 
E)  Xe B

Question 2

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. 
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. A

Question 3

Classify the following elements.
-argon

Accepted Answer

A) noble gas 
B) alkali metal 
C) nonmetal 
D) alkaline earth metal 
E) transition element
F)halogen 
A) noble gas 
B) alkali metal 
C) nonmetal 
D) alkaline earth metal 
E) transition element
F)halogen A

Question 4

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)  59 
A)  15 
B)  19 
C)  35 
D)  39 
E)  59

Question 5

The symbol for potassium is P.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) C 
B) Co 
C) Cu 
D) Cl 
E) Ca 
A) C 
B) Co 
C) Cu 
D) Cl 
E) Ca

Question 7

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. 
A)  2. 
B)  3. 
C)  5. 
D)  8. 
E)  10.

Question 8

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

Accepted Answer

A)  Ar 
B)  Br 
C)  S 
D)  O 
E)  P 
A)  Ar 
B)  Br 
C)  S 
D)  O 
E)  P

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Iodine is a metal.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) one 
B) seven 
C) two 
D) eight 
E) five 
A) one 
B) seven 
C) two 
D) eight 
E) five

Question 12

Identify the metalloid in the following list.

Accepted Answer

A)  sulfur 
B)  fluorine 
C)  silver 
D)  copper 
E)  germanium 
A)  sulfur 
B)  fluorine 
C)  silver 
D)  copper 
E)  germanium

Question 13

Select the correct symbol for the element
-iron

Accepted Answer

A)  Ir 
B)  Fs 
C)  Fe 
D)  In 
E)  FE 
A)  Ir 
B)  Fs 
C)  Fe 
D)  In 
E)  FE

Question 14

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. 
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.

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

A)  sodium. 
B)  boron. 
C)  carbon. 
D)  strontium. 
E)  chlorine. 
A)  sodium. 
B)  boron. 
C)  carbon. 
D)  strontium. 
E)  chlorine.

Question 17

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

Accepted Answer

A) period 
B) neither 
C) group 
A) period 
B) neither 
C) group

Question 18

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. 
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.

Question 19

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

Question 20

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

Accepted Answer

A)  41
19 K. 
B)  19
41 K. 
C)  37
15 P. 
D)  15
37 P. 
E)  22
19 K. 
A)  41
19 K. 
B)  19
41 K. 
C)  37
15 P. 
D)  15
37 P. 
E)  22
19 K.

Exam 3: Atoms and Elements

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

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

Classify the following elements. -argon

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

The symbol for potassium is P.

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

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

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

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

Iodine is a metal.

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

Identify the metalloid in the following list.

Select the correct symbol for the element -iron

The mass number of an atom can be calculated from

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

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

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

Valence electrons are electrons located

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?

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

Chemistry and Measurements

Energy and Matter

Nuclear Chemistry

Compounds and Their Bonds

Chemical Reactions and Quantities

Gases

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Introduction to Organic Chemistry: Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

Carbohydrates

Carboxylic Acids and Esters

Lipids

Amines and Amides

Amino Acids and Proteins

Enzymes and Vitamins

Nucleic Acids and Protein Synthesis

Metabolic Pathways for Carbohydrates

Metabolism and Energy Production

Metabolic Pathways for Lipids and Amino Acids

Filters

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

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