Periodic Table quiz

All 8 questions. After you submit, each question shows the right answer and why. Back to the quick check

ExplorerQuestion 1 of 8

When Mendeleev made his periodic table, he left gaps for elements that had not been discovered yet.

True

False

ExplorerQuestion 2 of 8

In the periodic table, what are the columns called?

Periods

Molecules

Isotopes

Groups

InvestigatorQuestion 3 of 8

How is the modern periodic table ordered?

By date of discovery

By increasing atomic mass

By increasing atomic number

Alphabetically by name

InvestigatorQuestion 4 of 8

Why do elements in the same group often react in similar ways?

They have similar outer-shell electron arrangements

They have the same number of protons

They have the same atomic mass

They were all discovered at the same time

ScientistQuestion 5 of 8

Fluorine and chlorine are both in group 17. Predict the usual charge on their ions and explain using the table.

Your answer

AdvancedQuestion 6 of 8

Which element is the most electronegative, consistent with the periodic trend?

Caesium (lower left)

Iodine (lower down group 17)

Fluorine (upper right)

Carbon (middle of period 2)

AdvancedQuestion 7 of 8

Mendeleev predicted an atomic weight of about 68 for 'eka-aluminium'. Gallium, discovered in 1875, has 69.72. What does this show?

His table was useless because the numbers differ

The table's gaps could predict real elements and roughly what they would be like

Gallium is not the element he predicted

Atomic weights change over time

ExpertQuestion 8 of 8

Give an example of a question about the periodic table's structure that IUPAC has treated as unsettled, and state the alternatives.

Your answer