Periodic Table Trends

What significant contribution to the periodic table is Dmitri Mendeleev known for?

• Discovering the noble gases

• Creating the first version of the periodic table

• Introducing the concept of atomic number

• Identifying the properties of metals and non-metals

• Proposing the law of octaves

This scientist from question #1, above, predicted that the empty spaces on his periodic table represented _____.

• radioactive elements

• undiscovered elements

• isotopes

• ions

Who arranged the periodic table of elements in the order of atomic number?

• Dmitri Mendeleev

• Henry Mosely

• Marie Curie

• Albert Einstein

The periodic law states there is a periodic repetition of physical and chemical properties of the elements _____.

• when they are arranged in order of increasing atomic radii

• if only nonmetals are considered

• when they are arranged in order of increasing atomic mass

• when they are arranged in order of increasing atomic number

The vertical columns of the periodic table are called groups. Each period in the periodic table corresponds to _____.

What are valence electrons?

• Electrons in the outermost shell of an atom

• Electrons in the innermost shell of an atom

• Protons in the nucleus

• Neutrons in the nucleus

The horizontal rows of the periodic table are called periods. What do elements in the same periodic group have in common?

• They have the same number of protons.

• They have the same number of valence electrons.

• They have the same atomic mass.

• They are in the same state at room temperature.

What do elements in the same periodic periods have in common?

• They have the same number of protons.

• They have the same number of electron shells (energy levels).

• They have the same atomic mass.

• They are in the same group and have similar chemical properties.

How many elements are in a period in which only the s and p sublevels are filled?

Identify the sublevels in a period that contains 32 elements.

• s, d

• s, p

• s, p, d

• s, p, d, f