Which formula represents a substance that is an element?

How did Mendeleev organize the periodic table?

Today's modern periodic table is organized by what?

Which element makes up about 90% of the known universe?

In a periodic table, a set of properties repeats from

The periodic table is composed of

The majority of the periodic table is composed of

Which list of elements contains only metals?

Copper, gold and iron all have similar characteristics. They are shiny and conduct electricity. They can be hammered into a shape and drawn into wire. What classification of elements includes copper, gold and iron?

Atoms of different elements can join together in different arrangements to produce a variety of substances that are found on Earth. There are more than 100 known elements. Which of the following best describes these elements?

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