Question

across a period from left to right in the modern periodic table what is the number of electron shells ,number of valence electrons, electronegativity ,character of elements changes from____ to ____​

Answer 1

Concept: Elements are arranged in periodic table by increasing atomic number. Dimitri Mendeleev gave us modern periodic table. He leave the space for future invented elements in periodic table.

Find: Fill the blanks.

Solution:

Across a period from left to right in the Modern Periodic Table.

Number of electron shells in the periodic table remains the same.

Number of valence electrons in the periodic table are in increasing order.

Electronegativity in the periodic table will increases.

Characters of elements in the periodic table changes from positive to negative.

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