Question

10. Give reason;
i) elements show a periodic repetition of properties in the Modern Periodic Table
ii) the elements of group 18 in the Modern Periodic Table are called
zero valent?
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Answer 1

Answer:

i) The elements in the modern periodic table are arranged in order of increasing atomic number.

ii) Elements of group 18 in the modern periodic table are called Noble gases

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Answer 2

Answer:

(i) The repitation of the properties of elements is the due to the periodicity of the elements.

(ii) The elements in group 18 of the periodic table is called zero valent because their valent shell is filled with electrons/ because they posses octet rule.