Atomic Number and Atomic Mass

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons, and it holds most of the atom's mass.

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 atomic mass?

Back

Atomic mass is the weighted average mass of an atom's isotopes, measured in atomic mass units (amu).

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus.

Front

What is the mass number of an atom with 4 protons and 5 neutrons?

Back

The mass number is 9 (4 protons + 5 neutrons = 9).

Front

What is the relationship between atomic number and protons?

Back

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

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number determines the position of an element in the periodic table and its chemical properties.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom, with no electric charge.

Front

What is a proton?

Back

A proton is a positively charged subatomic particle found in the nucleus of an atom.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the average mass of an atom's isotopes, while mass number is the total number of protons and neutrons in a specific atom.