atomic number and mass number

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the mass number of an element?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

How do you calculate the number of neutrons in an isotope?

Back

Number of neutrons = Mass number - Atomic number.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the maximum number of electrons in the first energy level?

Back

The first energy level can hold a maximum of 2 electrons.

Front

What is the significance of the average atomic mass?

Back

The average atomic mass reflects the weighted average of all isotopes of an element based on their natural abundance.

Front

How many neutrons are in the isotope C-14?

Back

C-14 has 8 neutrons.

Front

What is the relationship between atomic number and element identity?

Back

The atomic number uniquely identifies an element; no two elements can have the same atomic number.

Front

What is the difference between ions and isotopes?

Back

Ions are atoms that have gained or lost electrons, resulting in a charge, while isotopes are variations of an element with different neutron counts.

Front

What is the most abundant isotope of lead if the average atomic mass is 207.2?

Back

The most abundant isotope of lead is likely lead-207.