1- An atom of a particular element contains 26 electrons, 30 neutrons, and 26 protons. What is the name of this element?

2- Where were the atoms that make up a newborn infant "manufactured"?

3- What element results if two protons were added to the nucleus of nickel (Ni)?

4- 2 L of water has a mass of -------- kg and a weight of----------- N.

5- A 7-kg solid piece of metal displaces 1 L of water. Its density is ________ kg/m³.