I believe the answer is californium because it is used in most metals and is very strong and expensive like gold and silver
<span>NaCH is not an element, it is a compound. An element can be found and identified on the periodic table to elements. A compound is a combination of two of more elements. NaCH is composed of three elements: Na (sodium), C (carbon) and H (hydrogen), making it a compound.</span>
Power = 
Delilah: 170J/30s = 5.66 W
Adam: 260J/20s = 13 W
As the Earth rotates on it’s axis we perceive the sky differently depending on where we are. This is known as a day, where the Earths rotation controls the day/night cycle. As Earth orbits the sun our axis wobbles, thus at different times in the year different regions of the Earth can see different areas in the sky.
Hope this helps!
Answer:
Silicon tetrafluoride
Explanation:
The symbol Si represents the element silicon, as shown in the periodic table.
The are 4 fluorines, so the prefix for fluoride must have tetra-
