Question 1

When did the first scientific discovery of an element occur?

Accepted Answer

1649

Answer

1850

Answer

1980

Answer

350 BC

Question 2

By 1869, scientist had discovered a total of how many elements?

Accepted Answer

63

Answer

101

Answer

200

Answer

10

Question 3

Who is Dmitri Mendeleev according to the reading?

Accepted Answer

a professor of chemistry at St. Petersburg University in Russia

Answer

a teacher at Harvard University

Answer

a  student of physics

Answer

a weatherman from India

Question 4

Mendeleev created a card for each of the known elements.  Which of the following items were NOT on the card

Accepted Answer

where the element was found

Answer

chemical and physical properties

Answer

element's symbol

Answer

atomic mass

Question 5

Was was Mendeleev's classification scheme successful?

Accepted Answer

because he recognized that several elements had not yet been discovered yet and he left spaces for them in his table

Answer

because it increased by atomic mass

Answer

because it helped determine the properties of each element

Answer

because it made sense and others agreed with him

Question 6

What did Mendeleev notice when he arranged his cards by increasing atomic mass?

Accepted Answer

he noticed that certain properties were periodic - they repeated in regular intervals

Answer

he didn't notice any patterns

Answer

he noticed that the atomic mass increased by 2

Answer

he noticed that the color of the elements changed in a pattern

Question 7

The periodic table has undergone several revisions since Mendeleev's time.

Accepted Answer

True

Answer

False

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