Animated Periodic Trends

What information do the periods of the periodic table provide about an atom?

• The number of protons in the nucleus.

• The number of shells or orbitals an atom is made up of.

• The atomic mass of the element.

• The number of valence electrons.

How does the atomic radius generally change as you move from left to right across a period in the periodic table?

• It increases.

• It decreases.

• It remains constant.

• It first increases, then decreases.

What is ionization energy?

• The energy released when an electron is added to an atom.

• The energy required to remove an electron from an atom.

• The ability of an atom to attract electrons in a chemical bond.

• The distance from an atom's nucleus to its outermost orbital.

How does electron affinity change as you move from left to right across a period in the periodic table?

• It decreases.

• It remains constant.

• It increases.

• It first decreases, then increases.