Unit 1 Review

Front

How do you find the mass of an element?

Back

Mass of an element is found by adding the number of protons and neutrons.

Front

What is the electron configuration of Magnesium?

Back

1s² 2s² 2p⁶ 3s²

Front

What is the average atomic mass of an isotope with 30% at 4 amu, 20% at 5 amu, and 50% at 3 amu?

Back

The average atomic mass is closest to 4 amu.

Front

What happens to electrons when they gain energy?

Back

Electrons move up one or more levels to an excited state.

Front

What is the electron configuration of a Chloride (Cl⁻) ion?

Back

1s² 2s² 2p⁶ 3s² 3p⁶.

Front

Define an isotope.

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in the nucleus of an atom, determining the element's identity.

Front

Explain the concept of ground state in atoms.

Back

The ground state is the lowest energy state of an atom, where electrons occupy the lowest available energy levels.

Front

What is the difference between an ion and a neutral atom?

Back

An ion is an atom that has gained or lost one or more electrons, resulting in a net charge, while a neutral atom has an equal number of protons and electrons.

Front

What does the term 'excited state' mean in relation to electrons?

Back

An excited state occurs when an electron absorbs energy and moves to a higher energy level.