Chemical Change and Chemical Bond — Science STD 8 — Question

Medium is …………… for generation of sound.

The element ………….. has two electrons in the K shell, but it is a noble gas.

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As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less _______.

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The unit of frequency is ___________________.

The part of matter having uniform composition is called ………………. .

Bronze contains atoms of the elements ……………. and ………….. .

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A drinking straw works on the existence of _________________ pressure.

Except hydrogen, the nuclei of all atoms contain ………….. .

Iodine and ……………. are the two non – metals having typical metallic lustre.

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Combing your hair makes a ________ charge on the comb.