Who developed was the first person credited with arranging the elements in a certain order?

Repeating patterns that occur at regular intervals are referred to as ________________.

Each horizontal row of elements is called a _________________.

Each vertical column of elements is called a _______________.

Who arranged the elements by increasing atomic number?

Which category of elements are semiconductors?

Which category of elements are ductile and malleable?

Group 1 elements are also known as the ______________________metals.

All _____________ have 2 electrons in their outer energy level.

The elements in Period 6 are called the _________________.

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