4 is sound energy and electrical 5 is nuclear energy 5 is mechanical
Answer:
C
Explanation:
Compounds cannot be separated by any physical means.
Answer:
Explanation:
loss of habitat and contact with humans
It is ionic bond because of Na valency and it is alkali metal and cl is non metal and it’s valency , they both share electron and make ionic bonding .
1. A. All the elements in the column have similar chemical properties.
2. Substances on the periodic table cannot be broken down into other substances and are therefore elements.