Mendeleev's periodic table

The chemical elements have been categorized to ease its study

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• False

The modern periodic table is the first real table for classifying elements.

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• False

The elements with similar properties have been put in horizontal periods.

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• False

The number of recorded elements in Mendeleev's table is about 103 elements.

• False

• True

Mendeleev's discovered that the properties of elements were repeated periodically by the beginning of each new group.

• False

• True

Mendeleev's arranged the elements descending to their atomic weights.

• False

• True

Mendeleev's put more than one element in the same place.

• True

• False

Moseley classified elements of each main group into two subgroups (A&b).

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• False