Atomic Structure and Periodic Table Flashcard

Front

What are energy shells?

Back

Regions around an atom's nucleus where electrons are most likely to be found.

Front

What is the mass number of an atom?

Back

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

Front

What is the maximum number of electrons that can be present in the second energy shell?

Back

8

Front

How many valence electrons does an atom of oxygen have?

Back

6

Front

What is the trend of valence electrons across a period in the periodic table?

Back

Increase.

Front

Define atomic number.

Back

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

Front

What is an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What are noble gases?

Back

Elements in Group 18 of the periodic table that are characterized by their lack of reactivity due to having a full valence shell.

Front

What is the octet rule?

Back

Atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.