Describe how the properties of elements in the same group differ to the properties of elements in the same period.

All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.

All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.

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Explanation:

Same group elements have the same physical properties and same elements in period have same chemical properties

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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