Question

DESCRIPTIVE QUESTIONS
1. Explain the following:
a) Modern periodic law
b)covalent radius​

Answer 1

Answer:

a) the law that the properties of the elements are periodic functions of their atomic numbers. ... (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

b) The covalent radius, rcov, is a measure of the size of an atom that forms part of one covalent bond. It is usually measured either in picometres or angstroms, with 1 Å = 100 pm. In principle, the sum of the two covalent radii should equal the covalent bond length between two atoms, R = r + r.

Explanation:

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Answer 2

Answer:

Modern periodic.........