Balanced when there are equal numbers of each kind of atom
That would be
b.neutrons
Same number of protons different number of neutrons
<u>Answer:</u> The original element is
<u>Explanation:</u>
Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a charge of +2 units.
The released alpha particle is also known as helium nucleus.
For the given alpha decay process of an isotope:
<u>To calculate A:</u>
Total mass on reactant side = total mass on product side
A = 208 + 4
A = 212
<u>To calculate Z:</u>
Total atomic number on reactant side = total atomic number on product side
Z = 82 + 2
Z = 84
The isotopic symbol of unknown element is
Hence, the original element is
The mass percent of a NaCl solution prepared by mixing 47.0 g NaCl with 125.0 Ml of pure water is 27.3%
calculation
% mass =mass of solute / mass of the solvent x 100
mass of the solute(NaCl )= 47 g
mass of the solvent = mass of pure water + mass of NaCl
convert 125 Ml of pure water to grams
that is 1 ml = 1 g therefore 125ml = 125 g
mass of solvent is therefore= 125g+ 47=172g
therefore the % mass = 47/172 x100 = 27.3 %
Answer:
oh sorry i cant but i might think the answer is adaptive but if not someone correct me and ill change this response hope that i could help
Explanation: