Atomic structure review

Front

What is the atomic number of an element?

Back

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

Front

How are elements arranged in the Periodic Table?

Back

Elements are arranged in order of increasing atomic number.

Front

What is the total number of neutrons in an atom of O-18?

Back

An atom of O-18 has 10 neutrons.

Front

What does the '1' in '1s' represent?

Back

The '1' represents the energy level of the electron.

Front

What is an orbital?

Back

An orbital is a region in an atom where there is a high probability of finding an electron.

Front

What is the mass of an electron compared to a proton and neutron?

Back

The mass of an electron is less than the mass of a neutron and a proton.

Front

Define valence electrons.

Back

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

Front

What is the significance of the mass number?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average mass of an element's isotopes, while mass number is the total count of protons and neutrons.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.