Atoms

Front

What is atomic mass?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

How do you determine the number of electrons in a neutral atom?

Back

In a neutral atom, the number of electrons is equal to the number of protons, which is the atomic number of the element.

Front

What is the atomic mass of Magnesium?

Back

The atomic mass of Magnesium is approximately 24.31 amu.

Front

If an atom has an atomic mass of 55.85, how many protons does it have?

Back

The number of protons is equal to the atomic number, which is 26 for Iron (Fe), not 55.85.

Front

What is the significance of the atomic number?

Back

The atomic number defines the element and is equal to the number of protons in the nucleus.

Front

What is the relationship between atomic mass and isotopes?

Back

Isotopes are variants of an element that have the same number of protons but different numbers of neutrons, affecting the atomic mass.

Front

What is the symbol for Magnesium?

Back

The symbol for Magnesium is Mg.

Front

How do you calculate the average atomic mass of an element with multiple isotopes?

Back

Average atomic mass = (mass of isotope 1 * relative abundance) + (mass of isotope 2 * relative abundance) + ...

Front

What is the electron configuration of Magnesium?

Back

The electron configuration of Magnesium is 1s² 2s² 2p⁶ 3s².

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 x 10²³ particles (atoms, molecules, etc.).