Lesson 14: Atomic Structure

Front

What is nuclide notation?

Back

Nuclide notation is a way of representing an isotope of an element, showing the element's symbol, atomic number (number of protons), and mass number (total number of protons and neutrons).

Front

How do you determine the nuclide notation for lithium with 3 protons and 4 neutrons?

Back

The nuclide notation for lithium is written as \( _3^{7}Li \), where 3 is the atomic number and 7 is the mass number (3 protons + 4 neutrons).

Front

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

Back

In a neutral atom, the number of protons equals the number of electrons, balancing the positive and negative charges.

Front

Who discovered the electron and proposed a new atomic model?

Back

J.J. Thomson discovered the electron in 1897 and proposed the 'plum pudding' model of the atom.

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 atomic number of chlorine?

Back

The atomic number of chlorine is 17, meaning it has 17 protons.

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom, contributing to the mass but not the charge.

Front

What are electrons?

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

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.