CHAPTER 2: ATOMIC STRUCTURE AND RADIOISOTOPES CPQ

Which isotope of Zirconium has the fewest number of neutrons?

	Isotope	Natural abundance
A	90Zr	52%
B	91Zr	11%
C	92Zr	17%
D	94Zr	17%
E	96Zr	3%

Choice A

How many electrons are in the valence energy level?

2

Which of the following is NOT the same for different isotopes of the same element?

• number of protons

• charge

• atomic number

• number of electrons

• mass number

mass number

____ is an important component of the immune system as well as required by many enzymes.

Zinc

According to the current model of the atom, the part of the diagram labeled B is made up of 

protons and neutrons

____ are neutral.

Neutrons

What is a common symptom of iodine deficiency?

enlarged thyroid

According to the periodic table, what types of elements are in group 1A?

alkali metals

Isotopes are elements with the same number of

protons but different numbers of neutrons.

____ is an important component hemoglobin. Without this protein, tissues become starved of oxygen, and fatigue and shortness of breath results.

Iron

What is the mass number of element X?

56

According to the periodic table, what types of elements are in group 7A?

halogens

According to the periodic table, how many valence electrons do the elements in the third row have.

It depends on the specific element.

What is the atomic number of element X?

25

Which of the following is NOT true for the atoms ¹²C, ¹³C, and ¹⁴C?

• They all have six electrons.

• They all have the same mass number.

• They are isotopes.

• They all have six protons.

• They all have the same atomic number.

They all have the same mass number.

Which of the following elements exists as an isotope with a mass number of 35 and an atomic number of 17?

• tellurium

• chlorine

• bromine

• sulfur-35

• argon

chlorine

____ have a mass of approximately 1 amu.

Protons and Neutrons.

According to the periodic table, the atomic mass of potassium (K) is ____.

39.10

____ have a negative charge.

Electrons

____ is most commonly ingested along with salt.

Iodine

The mass of an element is determined by:

protons and neutrons

Which pair correctly matches an element to its atomic number?

• 12.01 – C

• 9 – F

• 133 – Cs

• 39.94 – Ar

• 9.012 – Be

9 – F

How many electrons are in a neutral atom of element X?

25

Which pair does NOT correctly match an element symbol to its full name?

• 
  Cl – chlorine

• N – nitrogen

• H – helium

• C – carbon

• O – oxygen
  

H – helium

_____ are the subatomic particles that have the smallest mass.

Electrons

The identity of an element is determined by its number of _____.

Protons

Select the choice in which atomic number, mass number, number of neutrons, and number of protons listed is correct for phosphorous-32.

	Atomic number	Mass number	Number of neutrons	Number of protons
a.	15	32	32	15
b.	15	32	17	15
c.	17	15	15	17
d.	17	32	32	17
e.	16	32	16	16

Choice B

According to the periodic table, what types of elements are in group 8A?

noble gases

The number of protons is equal to the ____ in a neutral atom.

number of electrons

According to the current model of the atom, the part of the diagram labeled A is made up of

electrons.

Adding ____ to drinking water is a common practice in many cities, meant to strengthen tooth enamel and decrease dental cavities.

flourine

_____ have a positive charge.

Protons

According to the periodic table, what types of elements are in group 2A?

alkaline earth metals

According to the periodic table, the atomic number of potassium (K) is ______.

19