The element in group 1 of the periodic table that had the smallest atomic radius is A. Lithium.
Answer:
Number of Protons 48
Number of Neutrons 64
Number of Electrons 48
Explanation:
The mass number of an atom is the sum of the number of protons and neutrons in the nucleus of that atom
Answer : Normally in any chemical reaction, if the enthalpy change i.e. ΔH is positive which means it is greater than zero then it can be called as an Endothermic Reaction.
Whereas, the system under study is absorbing heat that is produced during the reaction. So if ΔH is found to be positive then it can be called as endothermic reaction.
Gamma rays have the highest penetrating power so it can only be stopped by thick layers of dense metal. :)
It must be made of matter because anything and everything is made up of atoms. The other three options are made of atoms but they are also matter.
