Physical Science Unit 1 Test - Atomic Structure

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons, resulting in a different atomic mass.

Front

What is the nuclear notation for an isotope?

Back

Nuclear notation is a way of representing isotopes using the element's symbol, the mass number (protons + neutrons) as a superscript, and the atomic number (number of protons) as a subscript.

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

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

Back

To find the number of neutrons, subtract the atomic number from the mass number (Neutrons = Mass number - Atomic number).

Front

What is the electron configuration for sodium?

Back

The electron configuration for sodium (Na) is 1s² 2s² 2p⁶ 3s¹.

Front

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

Back

The maximum number of electrons in the first energy level is 2.

Front

What is the significance of the outer shell electrons?

Back

Outer shell electrons, or valence electrons, determine an atom's chemical properties and reactivity.

Front

What group of elements does magnesium belong to?

Back

Magnesium belongs to the alkaline earth metals group.

Front

What is the electron arrangement for sulfur?

Back

The electron arrangement for sulfur is 2-8-6.

Front

What is the mass number of an atom?

Back

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