The melting point of potassium = 
Melting point of titanium = 
Titanium has a stronger metallic bonding compared to potassium. Titanium being a transition metal has greater number of valence electrons (4 valence electrons) contributing to the valence electron sea compared to potassium which has only one valence electron. The atomic size of Titanium much lower than that of potassium, so the bonding between Titanium atoms is stronger than that of potassium. Hence, the melting point of Titanium is much higher than that of potassium.
A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges, either between electrons and nuclei, or as the result of a dipole attraction
The correct answer is letter b. Radio Waves.
<span> Radio waves are generated </span>by way of <span>radio transmitters and </span>acquired by using<span> radio receivers. </span>one of a kind<span> frequencies of radio waves have </span>distinct<span> propagation </span>characteristics in the<span> Earth's </span>atmosphere<span>. It is also known to be a kind of electromagnetic radiation.</span>
So it could be used in every country(different languages) yet still understood
