Question

when chemists constructed the modern periodic table, did they have gaps or did they know every element? How were they able to predict what would fill the gaps?​

Answer 1

Answer:

They left gaps.

Explanation:

They knew as chemical reactions continue on the earth and as electrons are transmitted the gaps will be filled.

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Answer 2

When chemists constructed the modern periodic table, did they have gaps or did they know every element? How were they able to predict what would fill the gaps?​

• The structure for the contemporary periodic table was developed in 1869 by Russian chemist Dmitri Mendeleev, who left spaces for elements that had not yet been discovered. When placing the elements in groups according on their atomic weight, he would rearrange them if he discovered that they did not fit.
• When Dimtri Mendeleev was unable to identify an element that fit the patterns of the groups and periods he was utilising, he first employed gaps in the periodic table. Mendeleev utilised these gaps to encourage other scientists to start looking for unknown elements since he knew there will be some.
• The periodic functions of an element's characteristics are determined by its atomic number. Scientist Bohr developed an extended form of the periodic table, which was made by Warner and Rang, based on the Modern table. There are 7 periods and 18 groups in the periodic table.
• Mendeleev's achievement's genuine brilliance was in creating gaps for yet-to-be-discovered elements. Even the characteristics of five of these elements and their compounds were anticipated by him. Three of these elements were discovered during the course of the following 15 years, demonstrating the incredible accuracy of Mendeleev's predictions.
• Mendeleev's periodic chart had gaps, which he believed would be filled by previously undiscovered elements with the right qualities. Eka-boron, Eka-aluminum, Eka-silicon, and Eka-manganese are his names for them.

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