Ionic compounds are always salts forming between a metal and a non-metal
Examples include, but are not limited to
NaCl
BaF2
Cs2O
Sometimes an ionic compound can be composed of a metal + a polyatomic ion
Examples of polyatomic ions include
Phosphate PO4 3-
Chlorate ClO3-
Some ionic compounds with these polyatomic ions include
CsClO3
Ba3(PO4)2
Hope this helps. I can’t do much good if I can’t see the options.
You didn't say the following answers but it's Joule (J). If this answer doesn't match the offered ones, you can ask me again
The radio waves move at the speed of light:
, and they cover a distance of
to reach the people, so the time they take to cover this distance is
Instead, the sound waves move at speed of sound: v=350 m/s and they cover a distance of S=3.6 m, so the time they take to reach the people is
Therefore, the difference in time between the two messages is
A dark-colored (igneous rock,) commonly extrusive from volcanic eruptions and composed primarily of the minerals of calcic plagioclase and pyroxene, and sometimes olivine. Basalt is the fine-grained equivalent of gabbro.
A. strong electrostatic attraction to the nucleus