The Atom and Periodic Trends

Front

What is the Mass Number of an atom?

Back

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

Front

How do you calculate the number of neutrons in an isotope?

Back

Number of Neutrons = Mass Number - Atomic Number.

Front

Rank the following elements by increasing atomic radius: carbon, aluminum, oxygen, phosphorus.

Back

O < C < P < Al

Front

What is atomic mass?

Back

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

Front

Which element has the greatest ionization energy: Aluminum (Al) or Chlorine (Cl)?

Back

Chlorine (Cl) has the greatest ionization energy.

Front

What is an isotope?

Back

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

Front

Define atomic radius.

Back

Atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Front

What trend does atomic radius follow in the periodic table?

Back

Atomic radius increases down a group and decreases across a period from left to right.

Front

What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom in its gaseous state.

Front

How does ionization energy change across a period?

Back

Ionization energy increases across a period from left to right.