How many periods are there in the long form of the periodic table?

There are seven periods in the long form of the periodic table.

Fill in the blank: The Periodic Table arranges elements in order of their increasing ___ number.

Atomic

True or False: Mendeleev's Periodic Law did not account for the position of isotopes.

What were some of the anomalies found in Mendeleev’s Periodic Table?

Anomalies included the position of hydrogen, rare earths, isotopes, noble gases, anomalous pairs of elements, and the cause of periodicity.

Fill in the blank: The horizontal rows in the Periodic Table are referred to as ___ .

Periods

What is the significance of the vertical columns in the Periodic Table?

Vertical columns group elements.

• Elements share similar properties.

• Classification aids in predictions.

• Helpful for understanding trends.

What defines a group in the modern periodic table?

Elements in groups 3 to 12 of the periodic table are called ___ elements.

Transition elements.

True or False: The seventh period of the periodic table is complete.

False. The seventh period is yet an incomplete period.

Fill in the blank: The sixth period of the periodic table contains ___ elements.

32 elements.

What are the names of the elements in group 18 of the periodic table?

Noble or inert gases.

Short Answer: Describe the elements found in groups 1 and 2.

Reactive metals are placed in groups 1 and 2.

The energy required to remove an electron from a neutral atom is known as ___ energy.

Fill in the blank: The tendency of an atom to attract shared electrons in a molecule is referred to as its ___.

Riddle: I am the measure of the distance from the nucleus to the outer shell, changing as elements vary. What am I?