5.4 The Periodic Table

Which of the following statements about Mendeleev is false?

• He organized information about known elements into a table.

• All the metals ended up on one side of his table and all the non-metals ended up on the other side.

• He left gaps in his table for elements that had not be discovered yet.

• He arranged the elements by their atomic number.

The horizontal rows on the periodic table of elements are referred to as ___.

• periods

• groups

• families

The vertical columns on the periodic table of elements are referred to as ___.

• periods

• groups

• families

___ states that elements arranged in order of atomic number show a periodic repetition of properties.

• Atomic theory

• Periodic law

• Quantum Mechanical Model

• Bohr model

Group 18 is also known as ___.

• alkali metals

• alkaline earth metals

• halogens

• noble gases

Silver grey metals that react easily with water and air are know as ___.

• alkali metals

• alkaline earth metals

• halogens

• noble gases

___ are located on the left side and middle of the periodic table.

• Metals

• Non-metals

• Metalloids

• Transition metals

The atomic number is the number of ___.

• neutrons
• electrons
• ions

• protons

The number of electrons in a neutral atom equals the number of ___.

• neutrons
• electrons
• ions

• protons

The mass number is the sum of the ___ and ___.

• neutrons
• electrons
• ions

• protons