Chemistry Sem 1 Unit 3 The Periodic Table Mid-Unit

What was the key characteristic by which Dmitri Mendeleev arranged his periodic table?

• increasing atomic number

• increasing atomic mass

• date of discovery

• chemical and physical properties

What is the primary characteristic by which the modern periodic table is arranged?

• increasing atomic number

• increasing atomic mass

• date of discovery

• chemical and physical properties

What does the periodic law state?

• When elements are arranged in order of increasing atomic size, there is a recurring pattern to their physical and chemical properties.

• When elements are arranged in order of increasing atomic number, there is a recurring pattern to their physical and chemical properties.

• When elements are arranged in order of increasing atomic mass, there is a recurring pattern to their physical and chemical properties within a group.

• When elements are alphabetized, there is a periodic pattern to their physical and chemical properties within a period.

Which element has the same number of energy levels as aluminum (Al)

and the same number of valence electrons as calcium (Ca)

?

• magnesium (Mg)

• beryllium (Be)

• sodium (Na)

• potassium (K)

Which element has six energy levels?

• rubidium (Rb)

• cesium (Cs)

• potassium (K)

• sodium (Na)

What happens to the atomic size of the elements as one goes from the top to the bottom of a group?

• Atomic size stays the same as one moves from top to bottom in a group.

• Atomic size increases as one moves from top to bottom in a group.

• Atomic size decreases as one moves from top to bottom in a group.

• Atomic size changes randomly as one moves from top to bottom in a group.

How did Dmitri Mendeleev deal with elements that had not yet been discovered?

• He gave them names and properties and placed them in the table.

• He created them in his laboratory and placed them in the table.

• He ignored them, placing them in the table and shifting others when they were discovered.

• He left blanks for them in his periodic table, as he predicted they would be discovered.

How many valence electrons are in the outermost shell of all noble gases except helium?

• 1

• 4

• 7

• 8

Which statement explains why the alkali metals are so highly reactive?

• Alkali metals have eight valence electrons.

• Alkali metals have one valence electron.

• Alkali metals have two valence electrons.

• The outermost shell of an alkali metal is one electron away from being complete.

What is the name of the group to which chlorine belongs?

• noble gas

• alkali metal

• alkaline earth metal

• halogen