Periodic table

Front

What are Halogens?

Back

Halogens are a group of highly reactive non-metals found in Group 17 of the periodic table, including elements like fluorine, chlorine, bromine, iodine, and astatine.

Front

What is a cation?

Back

A cation is a positively charged ion that has lost one or more electrons. For example, Na+1 is a cation.

Front

What is electron affinity?

Back

Electron affinity is the amount of energy released when an electron is added to a neutral atom, indicating how much an atom wants to gain an electron.

Front

How do anions compare in size to their parent atoms?

Back

Anions are larger than their parent atoms because the addition of electrons increases electron-electron repulsion, causing the electron cloud to expand.

Front

What is a common example of a cation?

Back

A common example of a cation is Ca+2, which indicates that calcium has lost two electrons.

Front

What is the trend of ionization energy across a period?

Back

Ionization energy generally increases across a period from left to right due to increasing nuclear charge, which holds electrons more tightly.

Front

What is the trend of atomic size down a group?

Back

Atomic size increases down a group in the periodic table due to the addition of electron shells, which outweighs the increase in nuclear charge.

Front

What are noble gases?

Back

Noble gases are elements in Group 18 of the periodic table, known for their lack of reactivity due to having a full valence shell. Examples include helium, neon, and argon.

Front

What is electronegativity?

Back

Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties, allowing for predictions about element behavior.