Atomic Number, Mass Number, and Isotopes Quiz

What does the atomic number (Z) represent in an element?

How is the mass number (A) of an element calculated?

Which of the following pairs are isotopes?

If an element has an atomic number of 19 and a mass number of 41, how many neutrons does it have?

The notation for an isotope includes which of the following?

How many electrons does a neutral atom of chlorine with a mass number of 35 and atomic number of 17 have?

What is the relationship between the atomic number and the number of neutrons in an element?

Which of the following is NOT a group on the periodic table?

What are the horizontal rows in the Periodic Table called?

Which of the following groups contains the halogens?

Which type of element is typically a poor conductor of heat and electricity?

What characterizes metalloids in the Periodic Table?

What is the average atomic mass of an element generally based on?

Why is the atomic mass of carbon listed as 12.01 amu instead of 12.00 amu?

Which group of elements is referred to as alkali metals?

What are noble gases known for?

The atomic number (Z) is the number of protons in an atom's nucleus, defining its element.
The mass number (A) is the total number of protons and neutrons in an atom's nucleus.
The mass number can be calculated using the formula: mass number (A) = number of protons (Z) + number of neutrons
Isotopes are atoms of the same element with the same atomic number but different mass numbers.
Isotopes differ due to the varying number of neutrons in their nuclei.

The periodic table organizes elements based on their atomic number, with horizontal rows called periods and vertical columns called groups or families.
Elements in the same group tend to have similar chemical and physical properties.
Elements are categorized as metals, nonmetals, or metalloids based on their properties.
Metals are typically good conductors of heat and electricity.
Nonmetals are generally poor conductors of heat and electricity.
Metalloids have properties that are intermediate between metals and nonmetals.

The atomic mass unit (amu) is a standard unit used to measure the mass of atoms and molecules.
The average atomic mass of an element is the weighted average of the atomic masses of its naturally occurring isotopes.
The average atomic mass reflects the relative abundances of the different isotopes of an element.
For example, the average atomic mass of carbon is 12.01 amu, reflecting the presence of different carbon isotopes.