Periodic table

Who is he?

• I.V.Debereiner

• J.Ya. Berzelius

• D. I.Mendeleev

• M. V. Lomonosov

• D. A. Newlands

At the moment, the Periodic Table of Mendeleev contains ________ chemical elements.

• 118

• 117

• 119

• 121

• 116

___________ are rows in a table. At the moment there are seven of them. All elements of the same period have the same number of energy levels filled with electrons.

• Periods

• Series

• Groups

• Actinoids

• Lanthanides

___________ are columns. Elements with the same number of electrons at the external energy level of their atoms are combined into groups in the Periodic Table. In the short version of the table used in school textbooks, the elements are divided into eight groups. Each of them is divided into main (A) and secondary (B) subgroups, which combine elements with similar chemical properties.

• Periods

• Series

• Groups

• Actinoids

• Lanthanides

___________ have one important common property-radioactivity. All of them, except for uranium, are practically not found in nature and are synthesized artificially.

• Periods

• Series

• Groups

• Actinoids

• Lanthanides

Are the following judgments correct?

A. In the top-down group, non-metallic properties increase and the radius of the atom increases.

B. Over the period from left to right, the metallic properties increase and the electronegativity increases

• true only A

• true only B

• both judgments are incorrect

• both judgments are correct

Are the following judgments correct?

A. In the period from left to right, the radius of the atom increases and the charge increases.

B. The metallic properties of the elements do not depend on the number of electrons on the outer layer.

• True only A

• True only B

• Both judgments are correct

• Both judgments are incorrect

Who combined elements with similar chemical properties into triads?

• D. I.Mendeleev

• J.Ya. Berzelius

• I.V.Debereiner

• M. V. Lomonosov

What was the law of octaves?

• Every eighth element exhibits similar properties

• The differences between the elements begin with the eighth element

• The elements are arranged according to the valence

• The elements are grouped into seven groups

How many elements did Mendeleev include in his table?

• 63

• 15

• 28

• 30