Can someone help me ? I choice the element Xenon Xe

Xenon is element 54. in a perfect atom it would have 54 neutrons

refer to explanation in order V

Explanation:

Atomic number: 54

Protons: 54

Electrons: 54

Neutrons: 77

Mass Number: 131.293 U

6 (1/2): At the upper left is the atomic number, or number of protons. In the middle is the letter symbol for the element (e.g., H). Below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. At the very bottom is the name of the element (e.g., hydrogen).

6 (2/2): On the periodic table, the mass number is usually located below the element symbol.

I hope this helped!

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.