Do you know why Newlands proposed the law of octaves ? Explain your answer in terms of the modern structure of the atom .

Do you know why corrosion occurs?

Do you know why the floated seeds are lighter in weight?

Do you think Newland's law of octaves is correct ? Justify .

Do you know why a person gets tired standing at a place for a long time ?

Do all flowers have same parts? Give examples of some flowers and explain your answer.

(i) Newlands proposed the law of octaves. ii) The law of octaves was not valid for elements that had atomic masses higher than calcium. iii) Newlands left blanks for new elements in his periodic table. Which statement is wrong?

Write few sentences about Newland's law of octaves. The elements present on the right side of the modern periodic table known as.

Do you know, why farmers plough the field and leave so for sometime under the sun?