Atomic structure and electron configurations

Front

What are valence electrons?

Back

Valence electrons are the outermost electrons of an atom that are involved in chemical bonding.

Front

How many electrons does an atom of Argon have?

Back

An atom of Argon has 18 electrons.

Front

What is the electron configuration for the element with atomic number 15?

Back

The electron configuration for the element with atomic number 15 (Phosphorus) is 1s² 2s² 2p⁶ 3s² 3p³.

Front

How many electrons does an Iodine atom have?

Back

An Iodine atom has 53 electrons.

Front

How many electrons does an atom of Neon have?

Back

An atom of Neon has 10 electrons.

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons in the nucleus of an atom, which also equals the number of electrons in a neutral atom.

Front

What is the significance of electron configurations?

Back

Electron configurations describe the distribution of electrons in an atom's orbitals, which determines the atom's chemical properties and reactivity.

Front

What is the maximum number of electrons that can occupy a single orbital?

Back

A single orbital can hold a maximum of 2 electrons.

Front

What is the Aufbau principle?

Back

The Aufbau principle states that electrons occupy the lowest energy orbitals first before filling higher energy levels.

Front

What is Hund's rule?

Back

Hund's rule states that electrons will fill degenerate orbitals (orbitals of the same energy) singly before pairing up.