Chapter 4 Section 1 (2024-2025)

Front

What is the mass number defined as?

Back

The mass number is defined as the number of protons and neutrons in an atom.

Front

If an atom has 3 electrons, how many protons does it have?

Back

If an atom has 3 electrons, it has 3 protons.

Front

What is the atomic number of an atom with 3 protons?

Back

The atomic number of an atom with 3 protons is 3.

Front

If an atom has 10 electrons, how many protons does it have?

Back

If an atom has 10 electrons, it has 10 protons.

Front

An element has the mass number 12 and atomic number 6. How many neutrons does it have?

Back

The number of neutrons is 6 (mass number - atomic number = 12 - 6).

Front

What is the definition of atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

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

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is the significance of the mass number in identifying an element?

Back

The mass number helps identify the isotope of an element.

Front

What is an isotope?

Back

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