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In Mendeleev's (and the modern) periodic table, elements in each column have similar

• atomic mass.

• properties.

• atomic numbers.

• symbols.

Mendeleev left gaps in his periodic table because

• the table was too small.

• protons belonged there.

• the table was too full.

• no known elements fit there.

When was the original periodic table created?

• 1959

• 400 B.C

• 1869

• 1776

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

• He arranged all of the known elements by their atomic number

• He realised that there was an alphabetic pattern in element names.

• He predicted the existence (and properties) of new elements

• He identified the "law of triads" which became the groups

The periodic table is organized by the number of ______ in each element's nucleus

• neutrons
• protons
• electrons
• atoms

The melting point of gallium is __________.

• Really high - its hard to melt.

• really low because it is a gas at room temperature.

• about 86 degrees Fahrenheit and it can be melted with the warmth from a hand.

• about 300 Celsius and can be melted only with a propane torch.

Tags

NGSS.MS-PS1-4

How many elements does the periodic table currently have?

(Current = 2018)

• 60

• 118

• 181

• 227

Periodic means _________.

• Blank spaces

• Regular repeating pattern

• Very small

• Organized

Tags

NGSS.MS-ESS1-1

What was the primary basis for Mendeleev's arrangement of the elements in his periodic table?

• Atomic number

• Atomic mass

• Electron configuration

• Density

What was Dmitri Mendeleev's nationality?

• German

• French

• Russian

• British