Mendeleev and the Modern Periodic Table Flashcards

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What is the modern periodic table?

It is a chart of all the known elements. They are arranged so that elements with similar properties are in the same columns.

How did Mendeleev arrange the elements in his periodic table?

He put the elements in order of increasing relative atomic mass. He also lined up elements with similar properties in the same column.

Why did Mendeleev leave gaps in his periodic table?

He thought some elements had not been discovered yet. He left gaps where he believed these new elements would fit.

How did Mendeleev use his table to predict new elements?

He looked at patterns in the rows and columns. He used these patterns to predict the properties of the missing elements.

How did the discovery of new elements support Mendeleev's ideas?

New elements, such as gallium and germanium, were found later. Their properties were close to Mendeleev's predictions, so scientists trusted his table more.

In the modern periodic table, what are elements mainly arranged in order of?

They are arranged in order of increasing atomic number. This is the number of protons in the nucleus of each atom.

What is a group in the modern periodic table?

A group is a vertical column of elements. Elements in the same group have similar chemical properties.

What is a period in the modern periodic table?

A period is a horizontal row of elements. As you move across a period, the properties of the elements change in a pattern.

Give one way the modern periodic table is different from Mendeleev's table.

The modern table is arranged by atomic number, not by relative atomic mass like Mendeleev's table.

How does the modern periodic table help chemists predict reactions?

Elements in the same group behave in similar ways. This helps chemists predict how an element will react and what products it will form.